Question 1

A pharmaceutical company wants to test the effectiveness of a new drug. They divide patients into two groups: one receives the drug, and the other receives a placebo. Which type of study is this?

Accepted Answer

Experiment

Question 2

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

Accepted Answer

The temperature measured in degrees Celsius

Question 3

A researcher collects data on the birth years of Nobel Prize winners (e.g., 1921, 1950, 1987). What is the highest level of measurement for this data?

Accepted Answer

Interval

Question 4

Which sampling method is best described by dividing a city into neighborhoods, randomly selecting several neighborhoods, and surveying every household in those neighborhoods?

Accepted Answer

Cluster sampling

Question 5

A survey asks respondents to rate their satisfaction as 'very satisfied', 'satisfied', 'neutral', 'dissatisfied', or 'very dissatisfied'. What is the level of measurement for this data?

Accepted Answer

Ordinal

Question 6

Which of the following best describes a parameter?

Accepted Answer

A numerical measurement describing a characteristic of a population

Question 7

A quality control manager inspects every 10th item coming off a production line. What type of sampling is being used?

Accepted Answer

Systematic sampling

Question 8

Which of the following is an example of discrete data?

Accepted Answer

The number of books on a shelf

Question 9

A researcher wants to study the effect of a new teaching method. She randomly selects 5 schools from a district and includes all teachers from those schools in her study. What sampling method is this?

Accepted Answer

Cluster sampling

Question 10

Which of the following statements about the ratio level of measurement is TRUE?

Accepted Answer

It has a natural zero starting point and ratios are meaningful.

Question 11

A hospital administrator wants to estimate the average length of stay for all patients last year. She randomly selects 100 patient records from the hospital database. What is the population in this scenario?

Accepted Answer

All patients who stayed at the hospital last year

Question 12

Which of the following is a key step in the 'Analyze' phase of statistical thinking?

Accepted Answer

Graph the data

Question 13

A study collects data on the number of siblings each student has. What type of data is this?

Accepted Answer

Quantitative, discrete

Question 14

Which of the following best describes a census?

Accepted Answer

The collection of data from every member of a population

Question 15

A nutritionist records the calorie content of every meal served in a school cafeteria for one week. What is the level of measurement for the calorie data?

Accepted Answer

Ratio

Question 16

Which of the following is a potential pitfall of an observational study, as illustrated by the ice cream and drownings example?

Accepted Answer

Confusing correlation with causation due to lurking variables

Question 17

A researcher wants to ensure that both men and women are proportionally represented in a sample. She divides the population by gender and randomly selects from each group. What sampling method is this?

Accepted Answer

Stratified sampling

Question 18

Which of the following is NOT a characteristic of the nominal level of measurement?

Accepted Answer

Data can be arranged in order

Question 19

A study collects data on the colors of cars in a parking lot. What type of data is this?

Accepted Answer

Qualitative (categorical)

Question 20

Which of the following best describes a simple random sample?

Accepted Answer

Every member of the population has an equal chance of being selected, and every possible sample of the same size has an equal chance of being chosen.

Introduction to Statistics: Key Concepts, Data Types, and Sampling Methods

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