Review MOOC1

Which of the following are examples of predictive analysis? Select two answers

• A. Dashboard

• B. Pandemic trends predictions

• C. Understanding human languages

• D. Returning a summary of descriptive statistics for data

Which of the following statements about numeric and integer values are true? Select three answers

• A. A numeric value can be converted to an integer.

• B. The converted value of a numeric to an integer is always equal to the original numeric value.

• C. The converted value of an integer to a numeric is always equal to the original integer value.

• D. An integer can be converted to a numeric value.

Which R function saves a workspace to a.RData file?

• A. save.file()

• B. save.workspace()

• C. save.data()

• D. save.image()

In RStudio, which of the following statements about writing code in the File Editor and the Console are true? Select two answers?

• A. You write code in the Console when you want to try out R commands or run a few lines of code.

• B. Only files containing R code can be edited in the File Editor

• C. Code in the File Editor executes immediately as you type it so you can see the results quickly

• D. You write code, usually for multiple lines of code, in the File Editor and execute them in batch mode.

Complete the statement: A Jupyter Notebook is made up of a series of ___ that you can use to write, run, and interact with your code

• A. Cells

• B. Files

• C. Objects

• D. Workspaces

R can perform several forms of statistical computation. What is an example of hypothesis testing?

• A. Compute and visualize a correlation matrix among four different variables to see if they are correlated

• B. Testing if the mean values of the two groups are statistically different.

• C. Inferring an unknown mean value of a population from its samples.

• D. Obtaining a representative subset of data.

Which of the following data type conversions may be not allowed in R?

• A. Numeric (like 1 or 2) to integer

• B. Integer (like 1L or 2L) to numeric

• C. Character (like ‘1’. ‘A’, or ‘test’) to numeric       

• D. logical (like TRUE or FALSE) to numeric

After you write code in an R script file or the R Console, what component of the R environment parses the code into objects in memory?

• A. R data file

• B. R interpreter

• C. R variables, functions, and datasets

• D. R workspace

Which features of RStudio help facilitate code writing? Select two answers

• A. Syntax highlighting

• B. File Explorer

• C. Code auto completion

• D. Workspace visualization

True or False: Execution order does not matter when executing cells in a Jupyter notebook

• A. True

• B. False