Chapter 1 (1.7) Flashcards
1
Q
True or false: rows are variables and columns are observations.
A
False
2
Q
True or false: binary variables can take no more than two values.
A
True
3
Q
True or false: non-binary variables can take more than two values.
A
True
4
Q
What does “n” in R refer to?
A
The total number of observations in a dataframe.
5
Q
How are datasets typically organized?
A
As dataframes.
6
Q
True or false: an observation is the information collected from a particular individual or entity in the study.
A
True
7
Q
How is an observation in a dataframe denoted?
A
As “i”.
8
Q
How is the first observation in a dataframe written?
A
“i=1”.
9
Q
How is the 10th observation in a dataframe written?
A
“i=10”.
10
Q
Character variables contain what?
A
Text.
11
Q
Numeric variables contain what?
A
Numbers.
