Question 1

Which of the following best defines statistics?

Accepted Answer

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

Question 2

A researcher surveys 1,200 college students to estimate the average number of hours students study per week. The group of 1,200 students is called:

Accepted Answer

A sample

Question 3

Which of the following is an example of a population?

Accepted Answer

All registered voters in a country

Question 4

In a study, the average cholesterol level of all patients in a hospital is 190 mg/dL. This value is an example of:

Accepted Answer

A parameter

Question 5

A news report states, 'Based on a survey of 2,000 drivers, the average commute time in the city is 35 minutes.' What is the population in this context?

Accepted Answer

All drivers in the city

Question 6

Which of the following statements describes inferential statistics?

Accepted Answer

Using data from a sample to draw conclusions about a population

Question 7

A company reports that, in a survey of 500 employees, 60% are satisfied with their job. This 60% is an example of:

Accepted Answer

A statistic

Question 8

Which of the following best describes descriptive statistics?

Accepted Answer

Organizing and summarizing data using numbers, tables, or graphs

Question 9

A researcher wants to know the average height of all high school students in a state. She measures the heights of 300 randomly selected students. Which of the following is a sample statistic?

Accepted Answer

The average height calculated from the 300 students

Question 10

Suppose a study finds that 45% of a sample of 1,000 adults in a city exercise regularly. Which of the following is a possible inference using inferential statistics?

Accepted Answer

About 45% of all adults in the city exercise regularly.

Question 11

Which of the following is NOT a function of statistics?

Accepted Answer

Predicting the weather using only historical averages

Question 12

A medical researcher collects blood pressure readings from 150 patients to estimate the average blood pressure of all patients in the hospital. The average calculated from the 150 patients is:

Accepted Answer

A sample statistic

Question 13

Which of the following scenarios best illustrates the use of descriptive statistics?

Accepted Answer

A teacher calculates the average test score for her class and displays it in a bar graph.

Question 14

If $$\mu$$ represents the mean of a population and $$\overline{x}$$ represents the mean of a sample, which of the following is true?

Accepted Answer

$$\mu is a $$parameter and $$\overline{x} is a $$statistic.

Question 15

A study of 2,500 high school students found that the average time spent on homework per week is 7 hours. Which part of the study represents the descriptive branch of statistics?

Accepted Answer

Reporting that the average time spent is 7 hours

Question 16

Which of the following is an example of using inferential statistics in a real-world scenario?

Accepted Answer

Estimating the average income of all households in a city based on a survey of 500 households

Question 17

A university reports that the average GPA of all its students is 3.2. This value is:

Accepted Answer

A population parameter

Question 18

Which of the following best distinguishes a sample from a population?

Accepted Answer

A sample is a subset of a population.

Question 19

A survey of 1,000 randomly selected adults found that 25% prefer online shopping. What is the correct interpretation using inferential statistics?

Accepted Answer

It is likely that about 25% of all adults prefer online shopping.

Question 20

Which of the following is NOT an example of data?

Accepted Answer

A hypothesis about why plants grow faster in sunlight

Introduction to Statistics: Chapter 1 Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드