The Data Scientist’s Toolbox Quiz Answers - Coursera!

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Week - 1

Which of these is NOT one of the main skills embodied by data scientists?

• Artificial intelligence
• Hacking skills
• Substantive expertise

2. What is the most important thing in Data Science?

• The question you are trying to answer
• Statistical inference
• Working with large data sets

3. 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?

4. What’s the first step in the data science process?

• Communicate your findings
• Exploring the data
• Generating the question

5. Which of these is an example of a quantitative variable?

• Latitude
• Occupation
• Educational level

Week - 2

1. What does base R focus on?

• Mapping
• Statistical analysis
• Artificial intelligence

2. What is RStudio?

• A graphical user interface for R
• Version control software
• A programming language

3. What is the name of the quadrant in the bottom left corner of RStudio, in the default layout?

• History
• Plots
• Console

4. What command lists your R version, operating system, and loaded packages?

• versions()
• Sessioninfo()
• sessionInfo()

5. What file extension do Projects in R use?

• .Rproj
• .R
• .RPROJECT

Week - 3

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1. 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

2. On 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

3. Which of the following will initiate a git repository locally?

• git init
• git remote add
• git boom

4. 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

5. 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”

Week - 4

1. 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]

2. 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

3. 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?

• Exploratory
• Descriptive
• Predictive

4. What might a confounder be in an experiment looking at the relationship between the prevalence of white hair in a population and wrinkles?

• Age
• Socioeconomic status
• Sex

5. 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