Question 1

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

Accepted Answer

A parameter is a numerical summary of a population, while a statistic is a numerical summary of a sample.

Question 2

A researcher wants to know the average number of hours college students sleep per night. She surveys 200 students at her university and finds an average of 6.8 hours. What is the population in this study?

Accepted Answer

All college students.

Question 3

Which of the following variables is both quantitative and continuous?

Accepted Answer

The temperature in degrees Celsius recorded every hour.

Question 4

A study records the blood types (A, B, AB, O) of 500 patients. What is the level of measurement for blood type?

Accepted Answer

Nominal

Question 5

Which of the following is an example of a discrete variable?

Accepted Answer

The number of cars passing through a toll booth in an hour.

Question 6

A researcher collects data on the number of siblings each student in a school has. What type of data is this?

Accepted Answer

Quantitative, discrete

Question 7

Which of the following best describes inferential statistics?

Accepted Answer

Using data from a sample to make generalizations about a population.

Question 8

A survey asks respondents to rate their satisfaction on a scale from 1 (very dissatisfied) to 5 (very satisfied). What is the level of measurement for this variable?

Accepted Answer

Ordinal

Question 9

Which of the following is NOT a step in the process of statistics as described in the study materials?

Accepted Answer

Randomly assigning treatments to experimental units.

Question 10

A sample of 100 patients is used to estimate the average recovery time from a new surgery. The average recovery time in the sample is 14 days. What is this value called?

Accepted Answer

Statistic

Question 11

Which of the following variables is qualitative?

Accepted Answer

Type of smartphone owned (iPhone, Android, Other)

Question 12

A researcher wants to know if students who start school after 8:30 am have longer sleep duration. She collects data from 383 students and finds that each hour delay in start time is associated with 21 minutes longer sleep. What statistical process is she using when she applies these results to all high school students in the country?

Accepted Answer

Performing inference

Question 13

Which of the following is an example of continuous data?

Accepted Answer

The weight of apples in a grocery store.

Question 14

Suppose the mean annual salary of all employees at a company is \$55,000. What is this value considered?

Accepted Answer

A parameter

Question 15

Which of the following best describes a sample?

Accepted Answer

A subset of the population that is being studied.

Question 16

A researcher records the daily high temperature in degrees Fahrenheit for a month. What is the level of measurement for this variable?

Accepted Answer

Interval

Question 17

Which of the following is an example of ratio level of measurement?

Accepted Answer

The number of adults in a study.

Question 18

A teacher wants to summarize the test scores of her class using the mean, median, and a histogram. What type of statistics is she using?

Accepted Answer

Descriptive statistics

Question 19

Which of the following statements about variables is correct?

Accepted Answer

A variable is any characteristic or attribute that can assume different values among individuals.

Question 20

A study records the names of universities attended by 1,000 graduates. What type of variable is 'name of university'?

Accepted Answer

Qualitative

Introduction to Statistics: Key Concepts, Types of Data, and Levels of Measurement

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