Question 1

Which of the following best describes the primary purpose of statistics?

Accepted Answer

To make sense of data and understand how and why data vary.

Question 2

A university study measured reaction times of sober, drunk, and texting drivers in simulated emergencies. Which of the following is the 'What' in this study?

Accepted Answer

The reaction times measured for each driver.

Question 3

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

Accepted Answer

Favorite color.

Question 4

A company records the following information for each customer: customer number, age, and purchase amount. Which variable is an identifier?

Accepted Answer

Customer number

Question 5

Which of the following best describes a sample in statistics?

Accepted Answer

A subset of the population used to make inferences about the population.

Question 6

In a Consumer Reports article about tablets, the variables listed include manufacturer, price, battery life, operating system, overall quality score, and memory card reader. Which of these is a quantitative variable?

Accepted Answer

Price

Question 7

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

Accepted Answer

Olympic medal rank: Gold, Silver, Bronze

Question 8

Suppose Amazon uses your age to show you age-appropriate images. If age is grouped as 'Child', 'Teen', 'Adult', and 'Senior', how is age being treated?

Accepted Answer

As a categorical variable

Question 9

Which of the following statements about models in statistics is correct?

Accepted Answer

Models are simplified representations used to understand complex phenomena.

Question 10

A researcher wants to know if texting while driving is as dangerous as drunk driving. She measures reaction times in a driving simulator. What is the 'Why' of this study?

Accepted Answer

To compare the dangers of texting and drunk driving.

Question 11

Which of the following is NOT a recommended step when organizing and presenting data?

Accepted Answer

Only present raw, unorganized data to avoid bias.

Question 12

Which of the following is a potential pitfall when classifying variables?

Accepted Answer

Assuming a variable is quantitative just because its values are numbers.

Question 13

A Likert scale (Strongly Disagree, Disagree, Agree, Strongly Agree) is best classified as which type of variable?

Accepted Answer

Ordinal

Question 14

Which of the following best describes a population in statistics?

Accepted Answer

The entire group of individuals or items we want information about.

Question 15

Suppose you are analyzing a database of Amazon purchases. Each row contains a purchase record. What is the 'Who' in this context?

Accepted Answer

The purchase records themselves.

Question 16

A study collects the following data: student ID, GPA, and major. Which variable is most likely to be used as an identifier?

Accepted Answer

Student ID

Question 17

Which of the following is a quantitative variable with units?

Accepted Answer

Battery life in hours

Question 18

A researcher wants to generalize findings from a sample to a population. Which of the following must be true about the sample?

Accepted Answer

It should be representative of the population.

Question 19

Which of the following is an example of a variable that can be either categorical or quantitative, depending on how it is used?

Accepted Answer

Age

Question 20

Suppose a study uses the following scale for pain: 0 = No pain, 1 = Mild, 2 = Moderate, 3 = Severe. What type of variable is this?

Accepted Answer

Ordinal

Introduction to Statistics: Understanding Data and Variables

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