Question 1

Which of the following best describes the four-step statistical process depicted in the first image?

Accepted Answer

Formulate questions, collect data, analyze data, interpret results

Question 2

In the second image, what does the smaller group (Sample) represent in relation to the larger group (Population)?

Accepted Answer

A subset of the population selected for study

Question 3

What is the term for the entity represented by the single figure in the third image?

Accepted Answer

Individual (or subject/unit)

Question 4

Based on the pie chart in the fourth image, what can you infer about the prevalence of study types in research?

Accepted Answer

Observational studies are much more common than experiments

Question 5

In the fifth image, which group serves as the control group in the experiment?

Accepted Answer

The group labeled 'Placebo'

Question 6

What is the main purpose of using a placebo in an experiment, as illustrated in the fifth image?

Accepted Answer

To serve as a comparison group to measure the treatment effect

Question 7

Which sampling method is depicted in the top panel of the last image, where observations are chosen randomly from the entire group?

Accepted Answer

Simple random sampling

Question 8

In the middle panel of the last image, what is the main feature of stratified sampling?

Accepted Answer

Random samples are taken from each subgroup (stratum)

Question 9

In the bottom panel of the last image, what distinguishes cluster sampling from stratified sampling?

Accepted Answer

Entire clusters are selected at random, and all individuals within chosen clusters are sampled

Question 10

Suppose you want to estimate the average commute time for all students at a university. You randomly select 100 students from the university roster. What type of sampling is this?

Accepted Answer

Simple random sampling

Question 11

A researcher divides a population into age groups and then randomly selects individuals from each age group. What is this sampling method called?

Accepted Answer

Stratified sampling

Question 12

Which of the following best describes a parameter?

Accepted Answer

A numerical summary calculated from the entire population

Question 13

If a study collects data by surveying every 10th person on a list, what type of sampling is being used?

Accepted Answer

Systematic sampling

Question 14

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

Accepted Answer

Number of hospital visits in a year

Question 15

A survey asks, 'Do you agree that this excellent program should continue?' What type of bias might this question introduce?

Accepted Answer

Response bias

Question 16

Which of the following statements about observational studies is TRUE?

Accepted Answer

They can show correlation but not causation

Question 17

In a double-blind experiment, who knows the treatment assignments?

Accepted Answer

Only an independent third party

Question 18

Which of the following is a key feature of a matched pairs experimental design?

Accepted Answer

Each subject receives both treatments or is paired with a similar subject

Question 19

A researcher wants to study the effect of a new fertilizer on plant growth. She randomly assigns half of her plants to receive the new fertilizer and the other half to receive no fertilizer. What type of experimental design is this?

Accepted Answer

Completely randomized design

Question 20

If a survey about internet access is conducted only online, what type of bias is most likely to occur?

Accepted Answer

Undercoverage bias

Introduction to Statistics: Foundations, Data Types, Study Designs, and Sampling Methods

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