Question 1

Which of the following best defines a 'population' in statistics?

Accepted Answer

The entire group of individuals or objects to be studied.

Question 2

In the process of statistics, what is the first step a researcher should take?

Accepted Answer

Identify the research objective and the population to be studied.

Question 3

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

Accepted Answer

Government type (e.g., Republic, Monarchy).

Question 4

A researcher records the number of cars arriving at a drive-thru between 12:00 P.M. and 1:00 P.M. What type of variable is this?

Accepted Answer

Discrete quantitative variable.

Question 5

Which of the following variables is measured at the interval level?

Accepted Answer

Temperature in degrees Celsius.

Question 6

What distinguishes a parameter from a statistic?

Accepted Answer

A parameter is a numerical summary of a population; a statistic is a summary of a sample.

Question 7

Which step in the process of statistics involves using methods to extend sample results to the population and measure reliability?

Accepted Answer

Perform inference.

Question 8

Given the variable 'volume of water lost each day through a leaky faucet,' what type of variable is this?

Accepted Answer

Continuous quantitative variable.

Question 9

Which of the following best describes the nominal level of measurement?

Accepted Answer

Values name, label, or categorize without a ranked order.

Question 10

A survey of 1300 high school students found that 32% reported being bullied. In this context, what is the population?

Accepted Answer

All high school students in grades 9 to 12.

Question 11

Which of the following variables is measured at the ratio level?

Accepted Answer

Volume of water used by a household in a day.

Question 12

If a researcher wants to study the demographic characteristics of all households in the United States but surveys 50,000 households, what is the sample?

Accepted Answer

The 50,000 households surveyed.

Question 13

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

Accepted Answer

Number of Sequoia trees in a randomly selected acre.

Question 14

A variable that allows for ranking but does not have meaningful differences between values is measured at which level?

Accepted Answer

Ordinal.

Question 15

Which of the following is NOT a step in the process of statistics?

Accepted Answer

Calculate the mean of the population.

Question 16

In Table 1, 'Life Expectancy (years)' is an example of which type of variable?

Accepted Answer

Continuous quantitative variable.

Question 17

Which of the following best describes inferential statistics?

Accepted Answer

Extending results from a sample to a population and measuring reliability.

Question 18

A quality-control manager selects 50 bottles of Coca-Cola to assess the calibration of the filling machine. What is the population?

Accepted Answer

All bottles of Coca-Cola filled on October 15.

Question 19

Which of the following variables is measured at the ordinal level?

Accepted Answer

Movie ratings (one star through five stars).

Question 20

If $$x is $$the number of heads obtained after flipping a coin five times, which type of variable is $$x$$?

Accepted Answer

Discrete quantitative variable.

Introduction to Statistics: Data Collection and Types of Variables

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