Question 1

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

Accepted Answer

A population includes all outcomes of interest, while a sample is a subset of the population.

Question 2

A researcher wants to know the average cholesterol level of all adults in a city. She measures the cholesterol levels of 200 randomly selected adults. What is the parameter in this context?

Accepted Answer

The average cholesterol level of all adults in the city.

Question 3

Which of the following is an example of inferential statistics?

Accepted Answer

Using sample data to estimate the average income of all residents in a state.

Question 4

A news report states, '70% of 1500 surveyed drivers do not wear seatbelts.' What is the population?

Accepted Answer

All drivers in the region or country of interest.

Question 5

Which of the following is a qualitative (categorical) variable?

Accepted Answer

Type of car model (e.g., Fusion, Explorer, Expedition).

Question 6

Which level of measurement is represented by the following data: 'Pain level rated from 0 to 10'?

Accepted Answer

Ordinal

Question 7

A study divides households into income groups and randomly selects households from each group. What sampling technique is this?

Accepted Answer

Stratified sampling

Question 8

Which method of data collection would be most appropriate for studying the effect of a new medication on blood pressure?

Accepted Answer

Experiment

Question 9

A researcher observes and records the behavior of children in a classroom without interfering. What type of study is this?

Accepted Answer

Observational study

Question 10

Which of the following is an example of a parameter?

Accepted Answer

The proportion of all U.S. adults who approve of the president.

Question 11

A researcher uses a random number table to select 10 students from a list of 200. What type of sampling is this?

Accepted Answer

Simple random sampling

Question 12

Which of the following best describes the placebo effect?

Accepted Answer

Subjects respond favorably to a fake treatment, believing it is real.

Question 13

In a double-blind experiment, who knows which subjects receive the treatment?

Accepted Answer

Neither the subjects nor the experimenters

Question 14

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

Accepted Answer

Base prices of vehicles in dollars

Question 15

A coffee shop owner remodels her shop at the same time a nearby mall opens. If business increases, what is the main statistical concern?

Accepted Answer

Confounding variables

Question 16

Which of the following is NOT a key element of experimental design?

Accepted Answer

Convenience

Question 17

A researcher selects every 10th person from a list of 1,000 employees. What sampling method is used?

Accepted Answer

Systematic sampling

Question 18

Which of the following is an example of descriptive statistics?

Accepted Answer

Reporting that 90% of married men in a study were alive at age 65.

Question 19

Which of the following is a common error that can make a statistical statement incorrect?

Accepted Answer

Improper data collection methods

Question 20

A study divides subjects into age groups, then randomly assigns each group to treatment or control. What design is this?

Accepted Answer

Randomized block design

Introduction to Statistics: Foundations, Data Types, and Experimental Design

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