Question 1

A researcher wants to know the average commute time for all employees at a large tech company. She surveys 50 randomly selected employees and finds their average commute time is 32 minutes. Which of the following best describes the 32 minutes?

Accepted Answer

It is a statistic because it describes a sample.

Question 2

Which of the following is an example of a population in a statistical study?

Accepted Answer

The salary of every employee at a marketing firm.

Question 3

A city council wants to know the average household income in the city. They use tax records to obtain the income of every household. What is the value calculated from this data called?

Accepted Answer

A parameter, because it is based on the entire population.

Question 4

Which of the following is NOT an example of quantitative data?

Accepted Answer

The brands of smartphones owned by students.

Question 5

A medical researcher records the blood types (A, B, AB, O) of 200 patients. What type of data is this?

Accepted Answer

Qualitative

Question 6

Which of the following is a discrete quantitative variable?

Accepted Answer

The number of books checked out from a library by a student.

Question 7

A survey finds that 46.5% of all registered voters in a country are registered democrats. Is this value a parameter or a statistic?

Accepted Answer

Parameter, because it describes the entire population.

Question 8

You measure the time (in minutes) it takes for each of 20 randomly selected patients to be seen by a doctor in an emergency room. What type of data is this?

Accepted Answer

Quantitative, continuous

Question 9

Which of the following best describes a sample?

Accepted Answer

A group of 50 students randomly selected from a university.

Question 10

A study records the eye color of 500 people. Which of the following statements is true?

Accepted Answer

Eye color is a qualitative variable.

Question 11

A report shows the amount (in dollars) spent by each customer in a grocery store. Is this data set a population or a sample?

Accepted Answer

Population, if it includes every customer.

Question 12

Which of the following is an example of continuous quantitative data?

Accepted Answer

The time (in seconds) it takes for a swimmer to complete a lap.

Question 13

A survey of 40 gym members from a large gym finds an average work out duration is 52 minutes. Is this a parameter or a statistic?

Accepted Answer

Statistic, because it is based on a sample.

Question 14

Which of the following best describes the difference between a parameter and a statistic?

Accepted Answer

A parameter describes a population, while a statistic describes a sample.

Question 15

You collect the test scores of every other student in a class. Is this data set a population or a sample?

Accepted Answer

Sample, because it includes only some students.

Question 16

A teacher records the favorite colors of all students in her class. What type of data is this?

Accepted Answer

Qualitative

Question 17

Which of the following is a correct example of a discrete quantitative variable?

Accepted Answer

The number of students present in a classroom.

Question 18

A company wants to know the average number of sick days taken by its employees last year. They use records for all employees. The value they calculate is:

Accepted Answer

A parameter, because it is based on the entire population.

Question 19

Which of the following is an example of qualitative data?

Accepted Answer

The eye color of students in a classroom.

Introduction to Statistics: Populations, Samples, Parameters, Statistics, and Types of Data

Guida di studio - Domande di pratica

Study guide - Flashcard