Question 1

Which of the following best describes the difference between a parameter and a statistic?

Accepted Answer

A parameter is a numerical description of a population characteristic, while a statistic is a numerical description of a sample characteristic.

Question 2

A researcher wants to estimate the average commute time for all students at a university. She randomly selects 100 students and calculates their average commute time. Which of the following is the population?

Accepted Answer

All students at the university.

Question 3

Which of the following is an example of inferential statistics?

Accepted Answer

Using the sample proportion of UCF students with scholarships to estimate the proportion of all UCF students with scholarships.

Question 4

Which of the following responses is considered qualitative data?

Accepted Answer

Political party affiliation.

Question 5

A UCF instructor asks her students if they have scholarships. Is the response quantitative or qualitative?

Accepted Answer

Qualitative

Question 6

Which level of measurement is represented by the body temperature of a patient in degrees Fahrenheit?

Accepted Answer

Interval

Question 7

A researcher divides a population of students into freshmen, sophomores, juniors, seniors, and graduate students, then randomly selects students from each group. What sampling method is being used?

Accepted Answer

Stratified sampling

Question 8

Which of the following best describes an observational study?

Accepted Answer

A researcher observes and measures characteristics of interest without changing existing conditions.

Question 9

In a clinical trial comparing CT scans and X-rays for detecting lung cancer, 50,000 smokers are randomly assigned to either screening method. What is the variable of interest?

Accepted Answer

The age at which the scanning method first detects a tumor.

Question 10

Which sampling method is illustrated by selecting every 5th student pulling into a parking garage, starting with the third vehicle?

Accepted Answer

Systematic sampling

Question 11

Which level of measurement is represented by movie genres: action, adventure, comedy, drama, horror?

Accepted Answer

Nominal

Question 12

A polling agency randomly selects 300 registered voters in a small city and asks if the voter favors a particular candidate. What sampling method is used?

Accepted Answer

Simple random sampling

Question 13

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

Accepted Answer

Number of people at Disney World

Question 14

A grocery manager selects every other egg carton to check for broken eggs. What sampling method is this?

Accepted Answer

Systematic sampling

Question 15

Which of the following best describes a cluster sample?

Accepted Answer

Divide the population into groups (clusters) and select all members from one or more clusters.

Question 16

A study tracks the heart rate of students during an exam. What level of measurement is heart rate?

Accepted Answer

Ratio

Question 17

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

Accepted Answer

Zero represents an inherent zero (true absence of the quantity).

Question 18

In the clinical trial at H. Lee Moffitt Cancer Center, what is the inference that will ultimately be drawn?

Accepted Answer

Which screening method (CT or X-ray) is more effective at detecting lung cancer earlier.

Question 19

A researcher randomly selects 10 Florida hospitals and interviews every nurse in each hospital. What sampling method is used?

Accepted Answer

Cluster sampling

Question 20

A study ranks the top 5 US occupations with the most job growth. What level of measurement is this ranking?

Accepted Answer

Ordinal

Chapter 1: Introduction to Statistics – Key Concepts and Applications

Guida di studio - Domande di pratica

Study guide - Flashcard