Chapter 1 (1.8-1.10)

Question 1

True or false: “mean” and “average” is the same thing in R.

Answer 1

True

Question 2

How do you access the values of a single variable?

Answer 2

You use the “$” character.

Question 3

What does a variable’s mean/average characterize?

Answer 3

Its central tendency.

Question 4

How do you calculate the mean of a variable?

Answer 4

You use the “mean()” function.

Question 5

True or false: the name of an object can begin with a number and contain “$” and “%”.

Answer 5

False

Question 6

The quantity in which a value is measured is called what?

Answer 6

“unit of measurement”.

Question 7

What’s the difference between interpreting the mean of a binary variable and a non-binary variable?

Answer 7

binary variables: multiply the result by 100 (%)
non-binary variables: keep the same unit of measurement as the variable