Question 1

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

Accepted Answer

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

Question 2

A researcher wants to know the average number of hours college students sleep per night. She surveys 200 randomly selected students from her university. In this context, what is the population?

Accepted Answer

All college students at her university

Question 3

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

Accepted Answer

Favorite type of music

Question 4

Suppose you are measuring the time (in seconds) it takes for a chemical reaction to complete. What type of variable is this?

Accepted Answer

Quantitative, continuous

Question 5

Which of the following variables is measured at the ordinal level?

Accepted Answer

Ranking of movies from best to worst

Question 6

A survey asks respondents to indicate their agreement with the statement 'I enjoy working with numbers' using the options: strongly agree, agree, disagree, strongly disagree. What is the level of measurement for this variable?

Accepted Answer

Ordinal

Question 7

Which of the following best describes inferential statistics?

Accepted Answer

Drawing conclusions about a population based on sample data

Question 8

A variable is measured at the interval level if:

Accepted Answer

It can be categorized, ranked, and differences between values are meaningful, but zero does not mean absence of the quantity

Question 9

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

Accepted Answer

The number of students in a classroom

Question 10

A researcher collects data on the brands of smartphones owned by students. What is the level of measurement for this variable?

Accepted Answer

Nominal

Question 11

Which of the following best describes the process of statistics?

Accepted Answer

Identify research objective, collect data, describe data, perform inference

Question 12

A study finds that the average income of a sample of 500 households is $$52,000. Which term best describes the value 52$$,000 in this context?

Accepted Answer

Statistic

Question 13

Which of the following is NOT a property of a variable measured at the ratio level?

Accepted Answer

The values cannot be ranked

Question 14

A nutritionist records the daily intake of whole grains (in grams) for a group of adults. What type of variable is 'daily intake of whole grains'?

Accepted Answer

Quantitative, continuous

Question 15

Which of the following scenarios best illustrates the concept of variability in data?

Accepted Answer

The number of hours students sleep each night differs

Question 16

A researcher wants to study the effect of school start time on sleep duration. She collects data from a random sample of 400 high school students. Which step of the statistical process is she performing?

Accepted Answer

Collecting the data

Question 17

Which of the following is an example of data at the nominal level of measurement?

Accepted Answer

Blood type (A, B, AB, O)

Question 18

A variable is classified as continuous if:

Accepted Answer

It can take on any value within an interval

Question 19

Which of the following best describes descriptive statistics?

Accepted Answer

Organizing and summarizing data using numerical summaries, tables, and graphs

Question 20

A teacher records the final exam scores (as percentages) for her class. What is the level of measurement for this variable?

Accepted Answer

Ratio

Chapter 1: Data Collection and Introduction to Statistics

Guida di studio - Domande di pratica

Study guide - Flashcard