Question 1

Which of the following best describes the difference between descriptive and inferential statistics?

Accepted Answer

Descriptive statistics refers to summarizing and analyzing data, while inferential statistics applies findings from a sample to a larger population.

Question 2

In a study investigating whether roasting coffee beans longer affects the amount of caffeine in brewed coffee, which variable is the explanatory variable?

Accepted Answer

The length of time spent roasting the beans

Question 3

A researcher collects data on the heights (in inches) of 100 students. Which type of variable is height?

Accepted Answer

Quantitative variable

Question 4

Which of the following statements about variables is TRUE?

Accepted Answer

A variable is a characteristic of cases, and its values are what is recorded for each case.

Question 5

In the ACS dataset, 'Sex' is coded as 0=female and 1=male. Is 'Sex' a categorical or quantitative variable?

Accepted Answer

Categorical, because it divides cases into groups.

Question 6

Which of the following best describes a 'case' in a dataset?

Accepted Answer

An individual object from which data are collected

Question 7

A survey asks students whether they smoke (Yes/No). The variable 'Smoke' is best described as:

Accepted Answer

Categorical, because it divides students into groups

Question 8

Which of the following is an example of a relationship between two quantitative variables?

Accepted Answer

BirthRate and LifeExpectancy

Question 9

A data table has rows for each student and columns for 'Age', 'Sex', and 'Income'. What is the value of the variable 'Income' for the student in row 5 if their income is $45,000?

Accepted Answer

The value is $45,000

Question 10

Which of the following best describes the purpose of an identifier variable?

Accepted Answer

To uniquely identify each case in a dataset

Question 11

In a study, researchers want to know if watching cat videos improves mood. Which variable is likely to be the response variable?

Accepted Answer

Mood score after watching videos

Question 12

Which of the following is TRUE about quantitative variables?

Accepted Answer

Their values are numbers for which operations like adding and averaging make sense.

Question 13

A census is best described as:

Accepted Answer

Collecting data from all members of the population

Question 14

Which of the following is a plausible reason why identifiers are usually not analyzed as variables?

Accepted Answer

They do not provide interesting information about the cases.

Question 15

If a variable records the percentage of a country's budget spent on health care, what type of variable is this?

Accepted Answer

Quantitative variable

Question 16

Which of the following best describes a relationship between two variables?

Accepted Answer

The values of one variable can be used to predict, explain, or understand the values of the other variable.

Question 17

A researcher wants to summarize the proportion of students who prefer an Olympic gold medal. Which type of statistic is this?

Accepted Answer

Descriptive statistic

Question 18

Which of the following is an example of a categorical variable with more than two categories?

Accepted Answer

Education with values HS, Some College, and College

Question 19

In a study, the variable 'HealthInsurance' is coded as 1=have health insurance and 0=no health insurance. Which statement is correct?

Accepted Answer

HealthInsurance is a categorical variable because it divides cases into groups.

Question 20

A researcher is interested in whether exercise affects award preference. If exercise is measured as hours per week and award preference as type of award, which variable is quantitative and which is categorical?

Accepted Answer

Exercise is quantitative; award preference is categorical.

Introduction to the Structure of Data in Statistics

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