Chapter 8 Base R Quiz
8.1 Instruction on the quiz
Quiz 1 consists of 5 multiple-choice problems.
Solve each of five problems in your own R markdown file.
- You DON’T need to submit any R markdown file for Quiz 1.
Once you solve all problems, then go to cyber campus and find Quiz 1.
Please mark the right answer to each of the 5 multiple choice problems.
Some quiz problems need the
round()
function, which will return the integer part of the provided number. For quiz responses, please round your answers to the two decimal place.
## [1] 3.14
8.2 Dataset: bfi
is a dataset in the psych
package containing 25 personality self report items taken from the International Personality Item Pool. In the dataset,
gender
represents gender (Males = 1, Females = 2),education
represent educational attainment (1 = HS, 2 = finished HS, 3 = some college, 4 = college graduate 5 = graduate degree),age
represents age in years, andE3
is one of the five items that measures extraversion (“Know how to captivate people”).
Let’s create three vectors for gender
, education
, and age
variables in the diamonds
dataset.
8.3 Quiz problem 1
What is the type of each of these vectors (character, integer, double, factor)?
8.4 Quiz problem 2
What proportion of the sample is females?
8.5 Quiz problem 3
What is the sample mean difference in E3
between males (gender = 1) younger than (<) 26 and females (gender = 2) younger than (<) 26? That is, mean of E3
for males younger than 26 - mean of E3
for females younger than 26.
8.6 Quiz problem 4
In the bfi
dataset, how many males with age 16 and highschool degree are there?
8.7 Quiz problem 5
Using the bfi
data set, what is the count of 42 year old females?