Question 1

Which of the following is a qualitative variable?

Accepted Answer

Eye color of individuals

Question 2

A researcher records the number of cars owned by each household in a city. What type of variable is this?

Accepted Answer

Quantitative, discrete

Question 3

Which of the following best describes a continuous variable?

Accepted Answer

A variable that can take on any value within an interval

Question 4

The U.S. Census Bureau collects data on household size. If the data is the number of people in each household, which of the following is true?

Accepted Answer

It is a quantitative, discrete variable

Question 5

Which of the following is the best method to organize qualitative data for easy comparison of categories?

Accepted Answer

Bar chart

Question 6

A frequency distribution is constructed for a set of survey responses about favorite ice cream flavors. What is the first step in creating this frequency distribution?

Accepted Answer

Write down the distinct values of the data

Question 7

If a pie chart is used to display the results of a survey on political party affiliation, what does each slice of the pie represent?

Accepted Answer

The proportion (relative frequency) of each category

Question 8

Which of the following statements about bar charts and pie charts is correct?

Accepted Answer

Bar charts have axes and are best for comparing categories

Question 9

A hospital records the weights of newborns in pounds. Which grouping method is most appropriate for organizing this continuous data?

Accepted Answer

Cutpoint grouping

Question 10

In limit grouping, what is the class width if the lower limit of one class is 20 and the lower limit of the next class is 30?

Accepted Answer

$$30 - 20 = 10$$

Question 11

Which of the following is NOT a characteristic of a histogram?

Accepted Answer

It is used to display qualitative data

Question 12

A dotplot is most appropriate for which type of data?

Accepted Answer

Small to moderate-sized quantitative datasets

Question 13

Which of the following best describes a stem-and-leaf diagram?

Accepted Answer

A diagram where each observation is separated into a stem and a leaf

Question 14

Given the following frequency distribution for a class: Class A: 10, Class B: 20, Class C: 30. What is the relative frequency of Class B?

Accepted Answer

$$\frac{20}{60} = 0.333$$

Question 15

Which of the following is a key difference between limit grouping and cutpoint grouping?

Accepted Answer

Limit grouping uses class limits, cutpoint grouping uses class cutpoints

Question 16

A frequency distribution table for the number of siblings in a sample of students is constructed. What type of grouping is most appropriate?

Accepted Answer

Single-value grouping

Question 17

If you want to know what proportion of survey respondents selected each option, which distribution should you construct?

Accepted Answer

Relative-frequency distribution

Question 18

Which of the following is the correct formula for calculating the class mark in limit grouping?

Accepted Answer

$$\frac{	ext{Lower class limit} + 	ext{Upper class limit}}{2}$$

Question 19

A dataset contains the heights (in cm) of 100 adult men. Which of the following would be the best way to visually display the distribution of this data?

Accepted Answer

Histogram

Question 20

Which of the following is a step in constructing a stem-and-leaf diagram?

Accepted Answer

Divide each observation into a stem and a leaf

STAT C1000: Variables and Data Organization (Sections 2.1–2.3)

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드