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

The sample

Question 3

Which of the following is an example of a population?

Accepted Answer

All registered voters in a country

Question 4

A numerical description of a population characteristic is called a:

Accepted Answer

Parameter

Question 5

Which of the following statements describes a sample statistic?

Accepted Answer

The average income of 1,000 surveyed households is $52,000.

Question 6

In a study, researchers found that 34% of a random sample of retail stores were not storing fish at the proper temperature. What is the population in this context?

Accepted Answer

All retail stores

Question 7

Which of the following best describes inferential statistics?

Accepted Answer

Drawing conclusions about a population based on sample data

Question 8

A news report states, 'Based on a survey of 2,000 drivers, the average commute time in the city is 35 minutes.' Which term best describes the value '35 minutes'?

Accepted Answer

Sample statistic

Question 9

Which of the following is an example of descriptive statistics?

Accepted Answer

Calculating the average test score of a class and displaying it in a bar graph

Question 10

Suppose a study finds that the average cost to move locally in the U.S. is $$1692 and the average cost to move long distance is 4401$$, based on a sample of 1,000 adults. Which of the following is a valid inference?

Accepted Answer

Long-distance moves tend to cost at least 2.5 times more than local moves.

Question 11

Which of the following best distinguishes between a parameter and a statistic?

Accepted Answer

A parameter describes a population; a statistic describes a sample.

Question 12

A company wants to know the average salary of all its employees. It surveys 50 randomly selected employees and finds an average salary of $60,000. Which of the following is true?

Accepted Answer

The average salary of $60,000 is a sample statistic.

Question 13

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

Accepted Answer

Using a sample of patients to estimate the average recovery time for all patients with a certain condition

Question 14

If $$p$$ represents a population proportion and $$\hat{p}$$ represents a sample proportion, which of the following is correct?

Accepted Answer

$$p is a $$parameter and $$\hat{p} is a $$statistic.

Question 15

A survey of 2,500 high school students found that 60% plan to attend college. Which of the following is the best description of the 60%?

Accepted Answer

A sample statistic

Question 16

Which of the following is NOT a function of descriptive statistics?

Accepted Answer

Making predictions about a population

Question 17

A researcher wants to estimate the average number of hours spent on social media by all teenagers in a city. She collects data from a randomly selected group of 300 teenagers. What is the population?

Accepted Answer

All teenagers in the city

Question 18

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

Accepted Answer

A sample is a subset of a population.

Question 19

Suppose a study reports, 'In a survey of 1,500 adults, 45% said they exercise regularly.' Which part of this study is descriptive statistics?

Accepted Answer

The statement that 45% of the surveyed adults exercise regularly

Question 20

Which of the following is an example of using statistics to make a real-world decision?

Accepted Answer

A doctor uses survey data to recommend a new treatment to patients.

Introduction to Statistics: Chapter 1 Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard