Q: What is the correct formula for calculating the injury rate in a sport?

$$\text{Injury Rate} = \frac{\text{Number of Injuries}}{\text{Number of Exposures}}$$

Question 1

Which of the following best describes the science of statistics?

Accepted Answer

The science of collecting, organizing, summarizing, and analyzing data to answer questions and/or draw conclusions.

Question 2

Why is context important when interpreting data such as the numbers 90, 95, 80, 75, and 92?

Accepted Answer

Because without context, we cannot determine what the numbers represent.

Question 3

A researcher surveys 100 randomly selected students at a university to determine the most common hair color. What is the population in this study?

Accepted Answer

All students at the university.

Question 4

Which of the following variables is categorical?

Accepted Answer

Type of pet owned

Question 5

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

Accepted Answer

Hours worked each week

Question 6

What is the correct formula for calculating the injury rate in a sport?

Accepted Answer

$$	ext{Injury Rate} = \frac{	ext{Number of Injuries}}{	ext{Number of Exposures}}$$

Question 7

Why are percentages or rates often better than raw counts when comparing groups?

Accepted Answer

Because they account for differences in group sizes.

Question 8

Which type of study allows researchers to establish causality between two variables?

Accepted Answer

Experiment

Question 9

In a study, participants are randomly assigned to receive either a new medication or a placebo. Neither the participants nor the researchers know who receives which treatment. What is this an example of?

Accepted Answer

Double-blind experiment

Question 10

A study finds that as ice cream sales increase, the number of drownings also increases. What is a likely confounding variable in this scenario?

Accepted Answer

Temperature outside

Question 11

Which of the following best describes a placebo effect?

Accepted Answer

Reacting to a treatment after being told you are receiving the treatment when, in fact, you are not.

Question 12

Which of the following is NOT a 'gold standard' for experiments?

Accepted Answer

Assigning subjects to groups based on their preference

Question 13

A two-way table is most useful for:

Accepted Answer

Organizing two potentially related categorical variables

Question 14

Which of the following is an example of an observational study?

Accepted Answer

Researchers observe the eating habits of students without assigning them to specific diets.

Question 15

What is a confounding variable?

Accepted Answer

A variable that has not been accounted for but is causing a change in the response variable being studied.

Question 16

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

Accepted Answer

A population is the complete set of all data values of interest, while a sample is a subset of the population.

Question 17

Which of the following is a step in the data cycle?

Accepted Answer

Analyze Data

Question 18

If a researcher wants to know if a new teaching method causes higher test scores, which study design should they use?

Accepted Answer

Experiment with random assignment

Question 19

Which of the following is a plausible research question you could investigate with a data set containing students' ages, GPAs, and total credits completed?

Accepted Answer

Do older students have higher GPAs?

Question 20

Which of the following best describes a treatment group in an experiment?

Accepted Answer

The group that receives the treatment or has the characteristic of interest.

Chapter 1: Introduction to Data – Structured Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드