Hello Peers, Today we are going to share all week’s assessment and quiz answers of the Regression Models course launched by Coursera totally free of cost✅✅✅. This is a certification course for every interested student.
In case you didn’t find this course for free, then you can apply for financial ads to get this course for totally free.
Check out this article – “How to Apply for Financial Ads?”
About The Coursera
Coursera, India’s biggest learning platform launched millions of free courses for students daily. These courses are from various recognized universities, where industry experts and professors teach in a very well manner and in a more understandable way.
Here, you will find Regression Models Exam Answers in Bold Color which are given below.
These answers are updated recently and are 100% correct✅ answers of all week, assessment, and final exam answers of Regression Models from Coursera Free Certification Course.
Use “Ctrl+F” To Find Any Questions Answer. & For Mobile User, You Just Need To Click On Three dots In Your Browser & You Will Get A “Find” Option There. Use These Option to Get Any Random Questions Answer.
About Regression Models Course
This course focuses on regression analysis, least squares, and inference based on regression models. Also covered will be special cases of the regression model, ANOVA, and ANCOVA.
Course Apply Link – Regression Models
Regression Models Quiz Answers
Week 1 Quiz Answers
Quiz 1: Quiz 1
Q1. Consider the data set given below
x <- c(0.18, -1.54, 0.42, 0.95)
And weights given by
w <- c(2, 1, 3, 1)
Give the value of \muμ that minimizes the least squares equation
- 0.300
- 1.077
- 0.1471
- 0.0025
Q2. Consider the following data set
x <- c(0.8, 0.47, 0.51, 0.73, 0.36, 0.58, 0.57, 0.85, 0.44, 0.42)
y <- c(1.39, 0.72, 1.55, 0.48, 1.19, -1.59, 1.23, -0.65, 1.49, 0.05)
Fit the regression through the origin and get the slope treating y
as the outcome and x as the regressor. (Hint, do not center the data since we want regression through the origin, not through the means of the data.)
- 0.8263
- -1.713
- -0.04462
- 0.59915
Q3. Do \verb|data(mtcars)|data(mtcars) from the datasets package and fit the regression
model with mpg as the outcome and weight as the predictor. Give
the slope coefficient.
- -9.559
- 30.2851
- -5.344
- 0.5591
Q4. Consider data with an outcome (Y) and a predictor (X). The standard deviation of the predictor is one half that of the outcome. The correlation between the two variables is .5. What value would the slope coefficient for the regression model with YY as the outcome and XX as the predictor?
- 4
- 1
- 3
- 0.25
Q5. Students were given two hard tests and scores were normalized to have empirical mean 0 and variance 1. The correlation between the scores on the two tests was 0.4. What would be the expected score on Quiz 2 for a student who had a normalized score of 1.5 on Quiz 1?
- 0.16
- 1.0
- 0.6
- 0.4
Q6. Consider the data given by the following
x <- c(8.58, 10.46, 9.01, 9.64, 8.86)
What is the value of the first measurement if x were normalized (to have mean 0 and variance 1)?
- 8.86
- 8.58
- 9.31
- -0.9719
Q7. Consider the following data set (used above as well). What is the intercept for fitting the model with x as the predictor and y as the outcome?
x <- c(0.8, 0.47, 0.51, 0.73, 0.36, 0.58, 0.57, 0.85, 0.44, 0.42)y <- c(1.39, 0.72, 1.55, 0.48, 1.19, -1.59, 1.23, -0.65, 1.49, 0.05)
- 2.105
- 1.567
- -1.713
- 1.252
Q8. You know that both the predictor and response have mean 0. What
can be said about the intercept when you fit a linear regression?
- Nothing about the intercept can be said from the information given.
- It is undefined as you have to divide by zero.
- It must be identically 0.
- It must be exactly one.
Q9. Consider the data given by
x <- c(0.8, 0.47, 0.51, 0.73, 0.36, 0.58, 0.57, 0.85, 0.44, 0.42)
What value minimizes the sum of the squared distances between these points and itself?
- 0.8
- 0.36
- 0.573
- 0.44
Q10. Let the slope having fit Y as the outcome and X as the predictor be denoted as \beta_1 β . Let the slope from fitting X as the outcome and Y as the predictor be denoted as \gamma_1 γ . Suppose that you divide \beta_1β by \gamma_1γ ; in other words consider \beta_1 / \gamma_1 β /γ . What is this ratio always equal to?
- Cor(Y, X)Cor(Y,X)
- Var(Y) / Var(X)Var(Y)/Var(X)
- 2SD(Y) / SD(X)2SD(Y)/SD(X)
- 1
Week 2 Quiz Answers
Quiz 1: Quiz 2
Q1. Consider the following data with x as the predictor and y as as the outcome.
x <- c(0.61, 0.93, 0.83, 0.35, 0.54, 0.16, 0.91, 0.62, 0.62)y <- c(0.67, 0.84, 0.6, 0.18, 0.85, 0.47, 1.1, 0.65, 0.36)
Give a P-value for the two sided hypothesis test of whether \beta_1 β
from a linear regression model is 0 or not.
- 0.025
- 2.325
- 0.391
- 0.05296
Q2. Consider the previous problem, give the estimate of the residual standard deviation.
- 0.05296
- 0.4358
- 0.3552
- 0.223
Q3. In the \verb|mtcars|mtcars data set, fit a linear regression model of weight (predictor) on mpg (outcome). Get a 95% confidence interval for the expected mpg at the average weight. What is the lower endpoint?
- 18.991
- -4.00
- 21.190
- -6.486
Q4. Refer to the previous question. Read the help file for \verb|mtcars|mtcars. What is the weight coefficient interpreted as?
- The estimated 1,000 lb change in weight per 1 mpg increase.
- The estimated expected change in mpg per 1,000 lb increase in weight.
- The estimated expected change in mpg per 1 lb increase in weight.
- It can’t be interpreted without further information
Q5. Consider again the \verb|mtcars|mtcars data set and a linear regression model with mpg as predicted by weight (1,000 lbs). A new car is coming weighing 3000 pounds. Construct a 95% prediction interval for its mpg. What is the upper endpoint?
- 21.25
- -5.77
- 14.93
- 27.57
Q6. Consider again the \verb|mtcars|mtcars data set and a linear regression model with mpg as predicted by weight (in 1,000 lbs). A “short” ton is defined as 2,000 lbs. Construct a 95% confidence interval for the expected change in mpg per 1 short ton increase in weight. Give the lower endpoint.
- -12.973
- -9.000
- -6.486
- 4.2026
Q7. If my X from a linear regression is measured in centimeters and I convert it to meters what would happen to the slope coefficient?
- It would get multiplied by 100.
- It would get multiplied by 10
- It would get divided by 10
- It would get divided by 100
Q8. I have an outcome, YY, and a predictor, XX and fit a linear regression model with Y = \beta_0 + \beta_1 X + \epsilonY=β. What would be the consequence to the subsequent slope and intercept if I were to refit the model with a new regressor, X + cX+c for some constant, cc?
- The new slope would be c \hat \beta_1cβ^1
- The new intercept would be \hat \beta_0 + c \hat \beta_1β^0+cβ^1
- The new intercept would be \hat \beta_0 – c \hat \beta_1β^0−cβ^1
- The new slope would be \hat \beta_1 + cβ^1+c
Q9. Refer back to the mtcars data set with mpg as an outcome and weight (wt) as the predictor. About what is the ratio of the the sum of the squared errors, \sum_{i=1}^n (Y_i – \hat Y_i)^2 ∑
i=1
when comparing a model with just an intercept (denominator) to the model with the intercept and slope (numerator)?
- 0.75
- 4.00
- 0.50
- 0.25
Q10. Do the residuals always have to sum to 0 in linear regression?
- If an intercept is included, the residuals most likely won’t sum to zero.
- If an intercept is included, then they will sum to 0.
- The residuals must always sum to zero.
- The residuals never sum to zero.
Week 3 Quiz Answers
Quiz 1: Quiz 3
Q1. Consider the \verb| mtcars| mtcars data set. Fit a model with mpg as the outcome that includes number of cylinders as a factor variable and weight as confounder. Give the adjusted estimate for the expected change in mpg comparing 8 cylinders to 4.
- -6.071
- -3.206
- -4.256
- 33.991
Q2. Consider the \verb| mtcars| mtcars data set. Fit a model with mpg as the outcome that includes number of cylinders as a factor variable and weight as a possible confounding variable. Compare the effect of 8 versus 4 cylinders on mpg for the adjusted and unadjusted by weight models. Here, adjusted means including the weight variable as a term in the regression model and unadjusted means the model without weight included. What can be said about the effect comparing 8 and 4 cylinders after looking at models with and without weight included?.
- Holding weight constant, cylinder appears to have less of an impact on mpg than if weight is disregarded.
- Within a given weight, 8 cylinder vehicles have an expected 12 mpg drop in fuel efficiency.
- Holding weight constant, cylinder appears to have more of an impact on mpg than if weight is disregarded.
- Including or excluding weight does not appear to change anything regarding the estimated impact of number of cylinders on mpg.
Q3. Consider the \verb|mtcars|mtcars data set. Fit a model with mpg as the outcome that considers number of cylinders as a factor variable and weight as confounder. Now fit a second model with mpg as the outcome model that considers the interaction between number of cylinders (as a factor variable) and weight. Give the P-value for the likelihood ratio test comparing the two models and suggest a model using 0.05 as a type I error rate significance benchmark.
- The P-value is larger than 0.05. So, according to our criterion, we would fail to reject, which suggests that the interaction terms may not be necessary.
- The P-value is small (less than 0.05). Thus it is surely true that there is no interaction term in the true model.
- The P-value is small (less than 0.05). So, according to our criterion, we reject, which suggests that the interaction term is not necessary.
- The P-value is small (less than 0.05). So, according to our criterion, we reject, which suggests that the interaction term is necessary
- The P-value is larger than 0.05. So, according to our criterion, we would fail to reject, which suggests that the interaction terms is necessary.
- The P-value is small (less than 0.05). Thus it is surely true that there is an interaction term in the true model.
Q4. Consider the \verb|mtcars|mtcars data set. Fit a model with mpg as the outcome that includes number of cylinders as a factor variable and weight inlcuded in the model as
lm(mpg ~ I(wt * 0.5) + factor(cyl), data = mtcars)
How is the wt coefficient interpretted?
- The estimated expected change in MPG per half ton increase in weight.
- The estimated expected change in MPG per half ton increase in weight for the average number of cylinders.
- The estimated expected change in MPG per half ton increase in weight for for a specific number of cylinders (4, 6, 8).
- The estimated expected change in MPG per one ton increase in weight.
- The estimated expected change in MPG per one ton increase in weight for a specific number of cylinders (4, 6, 8).
Q5. Consider the following data set
x <- c(0.586, 0.166, -0.042, -0.614, 11.72)y <- c(0.549, -0.026, -0.127, -0.751, 1.344)Give the hat diagonal for the most influential point
- 0.9946
- 0.2287
- 0.2025
- 0.2804
Q6. Consider the following data set
x <- c(0.586, 0.166, -0.042, -0.614, 11.72)y <- c(0.549, -0.026, -0.127, -0.751, 1.344)
Give the slope dfbeta for the point with the highest hat value.
- -.00134
- -134
- -0.378
- 0.673
Q7. Consider a regression relationship between Y and X with and without adjustment for a third variable Z. Which of the following is true about comparing the regression coefficient between Y and X with and without adjustment for Z.
- The coefficient can’t change sign after adjustment, except for slight numerical pathological cases.
- Adjusting for another variable can only attenuate the coefficient toward zero. It can’t materially change sign.
- For the the coefficient to change sign, there must be a significant interaction term.
- It is possible for the coefficient to reverse sign after adjustment. For example, it can be strongly significant and positive before adjustment and strongly significant and negative after adjustment.
Quiz 2: (OPTIONAL) Data analysis practice with immediate feedback (NEW! 10/18/2017)
Q1. You are being asked to participate in a research experiment with the purpose of better understanding how people analyze data. If you complete this quiz, you are giving your consent to participate in the study. This quiz involves a short data analysis that gives you a chance to practice the regression concepts you have learned so far.
We anticipate that this will take about 15 minutes to complete. You will be receiving feedback on your work immediately after submission. For this reason, we ask that you do not post on the forums about this quiz to maintain the integrity of this experiment.
Thank you for helping us learn more about data science! -Brian, Roger, Jeff
Your assignment is to study how income varies across different categories of college majors. You will be using data from a study of recent college graduates. Make sure to use good practices that you have learned so far in this course and previous courses in the specialization.
If you will proceed with the analysis, click “Yes”. Otherwise, click “No” and exit the quiz.
- Yes
- No
Q2. Your assignment is to study how income varies across college major categories. Specifically answer: “Is there an association between college major category and income?”
To get started, start a new R/RStudio session with a clean workspace. To do this in R, you can use the q() function to quit, then reopen R. The easiest way to do this in RStudio is to quit RStudio entirely and reopen it. After you have started a new session, run the following commands. This will load a data.frame called college for you to work with.
install.packages("devtools")devtools::install_github("jhudsl/collegeIncome")library(collegeIncome)data(college)
Next download and install the matahari R package with the following commands:
devtools::install_github("jhudsl/matahari")library(matahari)
This package allows a record of your analysis (your R command history) to be documented. You will be uploading a file containing this record to GitHub and submitting the link as part of this quiz.
Before you start the analysis for this assignment, enter the following command to begin the documentation of your analysis:
dance_start(value = FALSE, contents = FALSE)
You can then proceed with the rest of your analysis in R as usual. When you have finished your analysis, use the following command to save the record of your analysis on your desktop:
dance_save("~/Desktop/college_major_analysis.rds")
Please upload this college_major_analysis.rds file to a public GitHub repository. In question 4 of this quiz, you will share the link to this file.
A codebook for the dataset is given below:
- rank: Rank by median earnings
- major_code: Major code
- major: Major description
- major_category: Category of major
- total: Total number of people with major
- sample_size: Sample size of full-time, year-round individuals used for income/earnings estimates: p25th, median, p75th
- p25th: 25th percentile of earnings
- median: Median earnings of full-time, year-round workers
- p75th: 75th percentile of earnings
- perc_men: % men with major (out of total)
- perc_women: % women with major (out of total)
- perc_employed: % employed (out of total)
- perc_employed_fulltime: % employed 35 hours or more (out of employed)
- perc_employed_parttime: % employed less than 35 hours (out of employed)
- perc_employed_fulltime_yearround: % employed at least 50 weeks and at least 35 hours (out of employed and full-time)
- perc_unemployed: % unemployed (out of employed)
- perc_college_jobs: % with job requiring a college degree (out of employed)
- perc_non_college_jobs: % with job not requiring a college degree (out of employed)
- perc_low_wage_jobs: % in low-wage service jobs (out of total)
Question: Based on your analysis, would you conclude that there is a significant association between college major category and income?
- Yes
- No
Q3. Please type a few sentences describing your results.
What do you think?
Q4. Please upload the file generated by matahari (college_major_analysis.rds) to a public GitHub repository and paste the link to that file here.
What do you think?
Week 4 Quiz Answers
Quiz 1: Quiz 4
Q1. Consider the space shuttle data \verb|?shuttle|?shuttle in the \verb|MASS|MASS library. Consider modeling the use of the autolander as the outcome (variable name \verb|use|use). Fit a logistic regression model with autolander (variable auto) use (labeled as “auto” 1) versus not (0) as predicted by wind sign (variable wind). Give the estimated odds ratio for autolander use comparing head winds, labeled as “head” in the variable headwind (numerator) to tail winds (denominator).
- -0.031
- 0.031
- 1.327
- 0.969
Q2. Consider the previous problem. Give the estimated odds ratio for autolander use comparing head winds (numerator) to tail winds (denominator) adjusting for wind strength from the variable magn.
- 1.00
- 0.684
- 0.969
- 1.485
Q3. If you fit a logistic regression model to a binary variable, for example use of the autolander, then fit a logistic regression model for one minus the outcome (not using the autolander) what happens to the coefficients?
- The coefficients get inverted (one over their previous value).
- The coefficients change in a non-linear fashion.
- The coefficients reverse their signs.
- The intercept changes sign, but the other coefficients don’t.
Q4. Consider the insect spray data \verb|InsectSprays|InsectSprays. Fit a Poisson model using spray as a factor level. Report the estimated relative rate comapring spray A (numerator) to spray B (denominator).
- 0.9457
- 0.136
- 0.321
- -0.056
Q5. Consider a Poisson glm with an offset, tt. So, for example, a model of the form \verb|glm(count ~ x + offset(t), family = poisson)|glm(count ~ x + offset(t), family = poisson) where \verb|x|x is a factor variable comparing a treatment (1) to a control (0) and \verb|t|t is the natural log of a monitoring time. What is impact of the coefficient for \verb|x|x if we fit the model \verb|glm(count ~ x + offset(t2), family = poisson)|glm(count ~ x + offset(t2), family = poisson) where \verb|2 <- log(10) + t|2 <- log(10) + t? In other words, what happens to the coefficients if we change the units of the offset variable. (Note, adding log(10) on the log scale is multiplying by 10 on the original scale.)
- The coefficient estimate is multiplied by 10.
- The coefficient is subtracted by log(10).
- The coefficient estimate is divided by 10.
- The coefficient estimate is unchanged
Q6. Consider the data
x <- -5:5y <- c(5.12, 3.93, 2.67, 1.87, 0.52, 0.08, 0.93, 2.05, 2.54, 3.87, 4.97)
Using a knot point at 0, fit a linear model that looks like a hockey stick with two lines meeting at x=0. Include an intercept term, x and the knot point term. What is the estimated slope of the line after 0?
- -0.183
- -1.024
- 1.013
- 2.037
More About This Course
As their name suggests, linear models relate an outcome to a set of predictors of interest based on linear assumptions. The most significant statistical analytic tool for a data scientist is regression models, a subset of linear models. This course focuses on regression analysis, least squares, and inference based on regression models. Also covered will be special cases of the regression model, ANOVA, and ANCOVA. The analysis of residuals and variance will be conducted. This course will address contemporary perspectives on model selection and innovative applications of regression models, such as scatterplot smoothing.
This course is included in numerous curricula.
This course is applicable to a number of Specialization and Professional Certificate programs. This course will contribute to your education in any of the following programs:
- Data Science Specialization
- Statistics and Machine Learning Specialization in Data Science
WHAT YOU WILL Discover
- Utilize regression analysis, least squares, and deduction
- Comprehend ANOVA and ANCOVA model instances
- Investigate residual and variance analysis
- Describe innovative applications of regression models, like scatterplot smoothing.
SKILLS YOU WILL GAIN
- Model Selection
- Generalized Linear Model
- Linear Regression
- Regression Analysis
Conclusion
Hopefully, this article will be useful for you to find all the Week, final assessment, and Peer Graded Assessment Answers of Regression Models Quiz of Coursera and grab some premium knowledge with less effort. If this article really helped you in any way then make sure to share it with your friends on social media and let them also know about this amazing training. You can also check out our other course Answers. So, be with us guys we will share a lot more free courses and their exam/quiz solutions also, and follow our Techno-RJ Blog for more updates.
Heya i’m for the first time here. I came across this board and I to find It really useful & it helped me out a lot. I’m hoping to provide something again and help others like you helped me.
I always was interested in this subject and still am, thankyou for putting up.
Heya this is somewhat of off topic but I was wanting to know if blogs use WYSIWYG editors or if you have to manually code with HTML. I’m starting a blog soon but have no coding know-how so I wanted to get advice from someone with experience. Any help would be greatly appreciated!
Yeah bookmaking this wasn’t a risky conclusion great post! .
Thanks for another informative web site. The place else could I get that type of information written in such a perfect means? I’ve a mission that I’m just now operating on, and I have been on the look out for such info.
When I originally commented I clicked the “Notify me when new comments are added” checkbox and now each time a comment is added I get several e-mails with the same comment. Is there any way you can remove people from that service? Appreciate it!
Thanks so much for giving everyone remarkably breathtaking possiblity to read in detail from this blog. It is usually very kind plus packed with fun for me and my office co-workers to visit your web site really thrice every week to read the latest things you have. And lastly, I’m so at all times astounded considering the staggering tactics served by you. Some 3 facts in this post are undoubtedly the simplest we have ever had.
This really answered my problem, thank you!
Nice post. I was checking continuously this blog and I’m impressed! Very useful information specifically the last part 🙂 I care for such info a lot. I was looking for this certain info for a very long time. Thank you and best of luck.
My brother suggested I might like this website. He was entirely right. This post truly made my day. You can not imagine simply how a lot time I had spent for this info! Thank you!
I am usually to blogging and i really admire your content. The article has really peaks my interest. I am going to bookmark your web site and keep checking for new information.
Thanks for another great post. Where else could anybody get that type of info in such a perfect way of writing? I have a presentation next week, and I am on the look for such information.
I went over this web site and I think you have a lot of excellent information, bookmarked (:.
I do trust all of the ideas you have offered to your post. They are very convincing and will certainly work. Still, the posts are too brief for starters. Could you please prolong them a bit from subsequent time? Thanks for the post.
I really like your blog.. very nice colors & theme. Did you design this website yourself or did you hire someone to do it for you? Plz respond as I’m looking to design my own blog and would like to know where u got this from. many thanks
I’ll immediately grab your rss feed as I can’t in finding your email subscription link or e-newsletter service. Do you have any? Please let me understand in order that I may just subscribe. Thanks.
I’ve read several excellent stuff here. Definitely price bookmarking for revisiting. I surprise how much attempt you set to make this sort of excellent informative website.
Dead composed content material, Really enjoyed looking at.
Thanks a lot for sharing this with all of us you actually know what you are talking about! Bookmarked. Kindly also visit my web site =). We could have a link exchange agreement between us!
I got what you mean ,saved to favorites, very nice site.
I really appreciate this post. I’ve been looking everywhere for this! Thank goodness I found it on Bing. You have made my day! Thx again!
You are my intake, I own few web logs and sometimes run out from to post : (.
I admire your work, appreciate it for all the useful posts.
I am impressed with this internet site, really I am a fan.
Thank you for helping out, excellent information. “The surest way to be deceived is to think oneself cleverer than the others.” by La Rochefoucauld.
buy tadalafil 5mg pill liquid cialis buy ed pills generic
estrace online generic lamotrigine minipress 1mg for sale
avanafil 100mg ca how to buy tadacip diclofenac 100mg over the counter
order indocin 75mg pill suprax 100mg us order cefixime 100mg pills
oral nolvadex 20mg rhinocort sale buy ceftin pills for sale
buy trimox no prescription clarithromycin 250mg cheap oral biaxin 250mg
careprost tablet trazodone us desyrel pills
purchase clonidine catapres 0.1mg without prescription spiriva 9mcg cheap
minocycline order hytrin 1mg for sale buy pioglitazone online
order leflunomide 20mg online cheap purchase sildenafil online azulfidine where to buy
buy tadalafil 5mg without prescription sildenafil 50mg cost cialis 40mg
ivermectin humans oral prednisone 20mg cheap prednisone
An impressive share, I just given this onto a colleague who was doing a little analysis on this. And he in fact bought me breakfast because I found it for him.. smile. So let me reword that: Thnx for the treat! But yeah Thnkx for spending the time to discuss this, I feel strongly about it and love reading more on this topic. If possible, as you become expertise, would you mind updating your blog with more details? It is highly helpful for me. Big thumb up for this blog post!
cost altace buy altace 5mg online cheap cheap arcoxia 120mg
mesalamine pills astelin 10 ml cost avapro 300mg pills