Question 1

Which of the following best defines the term 'statistics' as used in the context of this course?

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 daily screen time. The group of 1,200 students is best described as:

Accepted Answer

A sample

Question 3

In a study, the average height of all adult males in a country is reported as 175 cm. This value is an example of:

Accepted Answer

A population parameter

Question 4

Which of the following statements is an example of inferential statistics?

Accepted Answer

Based on a survey of 1,000 voters, we predict that 60% of all voters support the new policy.

Question 5

A medical researcher collects blood pressure readings from 500 patients in a hospital. The average blood pressure calculated from these 500 patients is:

Accepted Answer

A sample statistic

Question 6

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

Accepted Answer

A population includes all members of a group of interest, while a sample is a subset of that group.

Question 7

A study reports that 32% of 1,000 surveyed 401(k) participants do not know how long their retirement savings will last. What is the population in this study?

Accepted Answer

All 401(k) retirement plan participants in the U.S.

Question 8

Which of the following is an example of descriptive statistics?

Accepted Answer

A report states that 21% of 8–11 year-olds have a social media profile.

Question 9

Suppose a university wants to know the average GPA of all its students. They randomly select 200 students and find their average GPA is 3.2. Which of the following is true?

Accepted Answer

3.2 is a sample statistic that estimates the population parameter.

Question 10

A city council wants to know the average commute time for all workers in the city. They use the average commute time from a survey of 1,500 workers to make a decision about public transportation. Which branch of statistics are they using to make their decision?

Accepted Answer

Inferential statistics

Question 11

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

Accepted Answer

A company summarizes last year's sales data in a bar chart.

Question 12

A survey of 834 employees found that 517 said their jobs were highly stressful. What is the sample proportion of employees who said 'yes'?

Accepted Answer

$$ \frac{517}{834} $$

Question 13

Which of the following is NOT a correct example of a parameter?

Accepted Answer

The average test score of 50 randomly selected students in a school.

Question 14

A study of 1,502 U.S. adults found that 18% of adults from households earning less than $30,000 annually do not use the internet. Which of the following is an inference that could be drawn from this study?

Accepted Answer

The internet may be less accessible to lower-income households.

Question 15

Which of the following best describes a statistic?

Accepted Answer

A numerical description of a sample characteristic.

Question 16

A food safety inspector checks 200 restaurants and finds that 34% are not storing fish at the proper temperature. What is the correct classification of the 34%?

Accepted Answer

A sample statistic

Question 17

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

Accepted Answer

A hospital administrator uses patient data to decide how many nurses to schedule for each shift.

Question 18

If $$ \mu $$ represents the average age of all people in a country, and $$ \bar{x} $$ represents the average age of a sample of people from that country, which of the following is true?

Accepted Answer

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

Question 19

Which of the following best illustrates the use of inferential statistics in a medical context?

Accepted Answer

Using data from a clinical trial of 500 patients to estimate the effectiveness of a new drug for all patients with the disease.

Introduction to Statistics: Key Concepts and Foundations

Guida di studio - Domande di pratica

Study guide - Flashcard