Question 1

Which of the following best describes the science of statistics?

Accepted Answer

The study of how to collect, organize, summarize, and analyze data to answer questions or draw conclusions.

Question 2

In the context of statistics, what is a population?

Accepted Answer

A collection of all data values that ever will occur for a group.

Question 3

Suppose you survey 2,500 people in your country about their hair color. Who is the sample?

Accepted Answer

The 2,500 people surveyed.

Question 4

Which of the following variables from the first table is numerical?

Accepted Answer

GPA

Question 5

Which variable from the first table is categorical?

Accepted Answer

Letter grade in class

Question 6

In the crash-test dummy study table, which of the following is a categorical variable?

Accepted Answer

Model

Question 7

In the crash-test dummy study table, which of the following is a numerical variable?

Accepted Answer

Weight

Question 8

What is the main advantage of using a sample instead of a population in a statistical study?

Accepted Answer

A sample is easier and more practical to obtain.

Question 9

Which of the following best describes 'stacked data'?

Accepted Answer

Data values stored in a spreadsheet format, with each row representing an individual and columns for variables.

Question 10

In the movie table, how many variables are present?

Accepted Answer

$$4$$

Question 11

Which variable in the movie table is categorical?

Accepted Answer

Certification

Question 12

Which variable in the movie table is numerical?

Accepted Answer

Vote_Average

Question 13

If you want to compare the average head injury score between cars with 2 doors and cars with 4 doors, which type of data storage would be most useful?

Accepted Answer

Stacked data, because it allows you to compare groups using a single variable.

Question 14

Which of the following is an example of coded data?

Accepted Answer

Recording gender as 0 for male and 1 for female.

Question 15

A researcher wants to know the average GPA of all university students but only surveys 200 students. What is the population?

Accepted Answer

All university students.

Question 16

Which of the following statements about statistics is TRUE?

Accepted Answer

Statistics helps us use evidence to check our beliefs.

Question 17

Which of the following is a multi-step process that best describes the use of statistics in a real-world scenario?

Accepted Answer

Collecting data, organizing it, summarizing the results, and analyzing to draw conclusions.

Question 18

If you want to know the most common flower variety in a garden, which type of variable are you analyzing?

Accepted Answer

Categorical

Question 19

Which of the following best describes unstacked data?

Accepted Answer

Data values stored in two columns, each representing a different group.

Question 20

A table lists the heights of men in one column and the heights of women in another column. What type of data storage is this?

Accepted Answer

Unstacked data

Introduction to Statistics: Data, Variables, and Data Organization

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