Question 1

Which of the following is a quantitative variable?

Accepted Answer

The number of cars a person owns

Question 2

A researcher wants to test if eating blueberries is associated with lower cholesterol. She randomly assigns participants to eat blueberries or not, then measures cholesterol. What type of study is this?

Accepted Answer

An experiment

Question 3

In a study, the explanatory variable is:

Accepted Answer

The variable that is manipulated or categorized to observe its effect

Question 4

A university president wants to survey students about campus safety. She divides the student body by class year (freshman, sophomore, junior, senior) and randomly selects 100 students from each group. What sampling method is used?

Accepted Answer

Stratified sampling

Question 5

A human resources department surveys every 10th employee on an alphabetical list. What type of sampling is this?

Accepted Answer

Systematic sampling

Question 6

A survey asks, "Don’t you agree that metal music leads to hearing loss?" What type of bias is most likely present?

Accepted Answer

Wording bias

Question 7

A village manager surveys only people at the local pool about building a new community pool. What is the most likely bias?

Accepted Answer

Sampling bias

Question 8

Given the following frequency table for survey responses:

Rarely: 122
Sometimes: 98
Most of the time: 180
Always: 100

What is the relative frequency of 'Most of the time' if the total number of responses is 500?

$$	ext{Relative Frequency} = \frac{	ext{Frequency}}{	ext{Total}}$$

Accepted Answer

$$0.36$$

Question 9

If 122 respondents answered 'Rarely' and 98 answered 'Sometimes' out of 500 total, what percentage answered 'Rarely' or 'Sometimes'?

$$	ext{Percentage} = \frac{122 + 98}{500} 	imes 100$$

Accepted Answer

$$44\%$$

Question 10

A Chipotle manager records the number of customers arriving in 5-minute intervals. Which type of data is this?

Accepted Answer

Discrete quantitative

Question 11

A histogram shows a distribution with a long tail to the left. How would you classify this distribution?

Accepted Answer

Skewed left

Question 12

Which of the following best describes a census?

Accepted Answer

A study that collects data from every member of the population

Question 13

Which of the following is an example of a nominal variable?

Accepted Answer

The state where a person was born

Question 14

A researcher wants to estimate the average height of students at a university. She randomly selects 200 students from the enrollment list. What is the population in this scenario?

Accepted Answer

All students at the university

Question 15

Which of the following is an example of an ordinal variable?

Accepted Answer

The rating of a restaurant (excellent, good, fair, poor)

Question 16

A study finds that people who exercise regularly have lower blood pressure. Which is the response variable?

Accepted Answer

Blood pressure

Question 17

A researcher uses a random number generator to select 50 students from a list of 1,000. What sampling method is this?

Accepted Answer

Simple random sampling

Question 18

Which of the following best describes a cluster sample?

Accepted Answer

Randomly selecting entire groups and including all members of those groups

Question 19

If a survey is conducted only among people who volunteer to participate, what type of bias is most likely?

Accepted Answer

Voluntary response bias

Question 20

A frequency table shows the following data for number of customers: 0 (5 times), 1 (10 times), 2 (15 times), 3 (20 times). What is the relative frequency for 3 customers if there are 50 total intervals?

$$	ext{Relative Frequency} = \frac{20}{50}$$

Accepted Answer

$$0.40$$

MTH 132 Exam 1 Review: Data Collection and Summarizing Data

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드