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The Data Scientists Toolbox Answer
Module One Summative Quiz
Which of these is NOT one of the main skills embodied by data scientists?
- Artificial intelligence
- Hacking skills
- Substantive expertise
What is the most important thing in Data Science?
- The question you are trying to answer
- Statistical inference
- Working with large data sets
Which of these might be a good title for a forum post?
- URGENT! R isn’t working!
- Removing rows with NAs in data.frame using subset(), R 3.4.3
- How do I get rnorm() to work?
What’s the first step in the data science process?
- Communicate your findings
- Exploring the data
- Generating the question
Which of these is an example of a quantitative variable?
- Educational level
Module Two Summative Quiz
What does base R focus on?
- Statistical analysis
- Artificial intelligence
What is RStudio?
- A graphical user interface for R
- Version control software
- A programming language
What is the name of the quadrant in the bottom left corner of RStudio, in the default layout?
What command lists your R version, operating system, and loaded packages?
What file extension do Projects in R use?
Module Three Summative Quiz
What is a good example of a message to accompany a commit?
- Modified linear model of height to include new covariate, genotype
- Fixed problem with linear model
- Updated thing
Question 2On each repository page in GitHub, in the top right hand corner there are three options. They are:
- Watch, star, fork
- Pull, clone, fork
- Commit, contributors, issues
Which of the following will initiate a git repository locally?
- git init
- git remote add
- git boom
What is the order of commands to send a file to GitHub from within RStudio?
- Commit > Push
- Stage > Commit message > Commit > Push
- Pull > Push > Commit
How do you add all of the contents of a directory to version control?
- git add .
- cd ~/dir/name/of/path/to/file
- git commit -m “Message”
Module Four Summative Quiz
What is the format for including a link that appears as blue text in your markdown document?
- [text that is shown](link.com)
- (link.com)[text that is shown]
- (text that is shown)[link.com]
Which of the following describes a predictive analysis?
- Using data collected in the past to predict values in the future
- Finding if one variable is related to another one
- Showing the effect on a variable of changing the values of another variable
We collect data on all the songs in the Spotify catalogue and want to
summarize how many are country western, hip-hop, classic rock, or other.
What type of analysis is this?
What might a confounder be in an experiment looking at the relationship
between the prevalence of white hair in a population and wrinkles?
- Socioeconomic status
Which one of the following is an example of structured data?
- The text from a series of books
- Lung x-ray images
- A table of names and student grades
Peer-graded Assignment: Assemble your toolbox
Set up a Github account (you may use your own name or a pseudonym).
Create a repo called datasciencecoursera
Copy and paste the link to your GitHub account (or a direct link to your datasciencecoursera repo)
Create a text file called HelloWorld.md
Add the line “## This is a markdown file” (without the quotation marks) to the document
Push the document to the datasciencecoursera repo you created on Github
Submit the link to the HelloWorld.md file on your Github repo.
Fork the data sharing repository here:
Copy and paste the link to the forked repository on your Github account.
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