Question 1

Which of the following best defines statistics as presented in the study materials?

Accepted Answer

The science of collecting, organizing, analyzing, and interpreting data to make decisions.

Question 2

A researcher surveys 1,200 college students to determine their average weekly study hours. The group of all college students in the country is called the:

Accepted Answer

Population

Question 3

Which of the following is an example of a parameter?

Accepted Answer

The average SAT math score of all freshmen at a university.

Question 4

In a study, 900 out of 2,000 surveyed adults report exercising regularly. What is the sample in this context?

Accepted Answer

The 2,000 surveyed adults

Question 5

Which statement best distinguishes between descriptive and inferential statistics?

Accepted Answer

Descriptive statistics summarize data; inferential statistics draw conclusions about populations based on samples.

Question 6

A news report states, 'In a survey of 1,000 drivers, 60% said they use their phone while driving.' What type of value is 60%?

Accepted Answer

Sample statistic

Question 7

Suppose a study finds that the average height of all basketball players in a league is 6.5 feet. This value is:

Accepted Answer

A population parameter

Question 8

Which of the following scenarios best illustrates inferential statistics?

Accepted Answer

Using data from a sample of 500 patients to estimate the average recovery time for all patients with a certain illness.

Question 9

A study reports: 'Of 1,500 surveyed high school students, 40% have part-time jobs.' What is the population?

Accepted Answer

All high school students

Question 10

Which of the following is NOT a function of statistics as defined in the study materials?

Accepted Answer

Predicting the outcome of a single random event with certainty

Question 11

A researcher wants to know the average income of all teachers in a state. She surveys 300 teachers and finds an average income of $$52,000. Which term best describes the 52$$,000?

Accepted Answer

Sample statistic

Question 12

Which of the following best describes the difference between a population and a sample?

Accepted Answer

A population includes all members of a group, while a sample includes only part of the group.

Question 13

In a study of 2,000 randomly selected households, 25% reported owning electric vehicles. Which of the following is an inference you could make from this study?

Accepted Answer

A significant portion of the general population may own electric vehicles.

Question 14

Which formula would you use to calculate the mean of a data set with $$n$$ values $$x_1$$, $$x_2$$, ..., x_n$$?

Accepted Answer

$$ \bar{x} = \frac{1}{n} \sum_{i=1}^{n} x_i $$

Question 15

A study finds that 32% of 401(k) retirement plan participants do not know how many years their savings might last. What type of statistic is this?

Accepted Answer

Sample statistic

Question 16

Which of the following is an example of descriptive statistics?

Accepted Answer

Reporting that 18% of surveyed adults from households earning less than $30,000 do not use the Internet.

Question 17

If a researcher uses data from a sample to make a generalization about a population, which branch of statistics is being used?

Accepted Answer

Inferential statistics

Chapter 1: Introduction to Statistics - Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드