Question 1

Which of the following best describes the science of statistics?

Accepted Answer

The science of collecting, organizing, analyzing, and interpreting data to draw conclusions.

Question 2

A researcher wants to know the average height of all university students. She measures the height of 100 randomly selected students. In this context, what is the population?

Accepted Answer

All university students.

Question 3

Which of the following is an example of a voluntary response sample?

Accepted Answer

An internet poll where users choose to participate.

Question 4

Why are voluntary response samples generally considered unreliable?

Accepted Answer

They are likely to be biased because participants self-select.

Question 5

In a study, 12 out of 30 randomly selected carbon monoxide detectors failed to alarm in hazardous conditions. What is the sample in this study?

Accepted Answer

The 30 carbon monoxide detectors tested.

Question 6

Which of the following best defines statistical significance?

Accepted Answer

A result is statistically significant if the likelihood of it occurring by chance is 5% or less.

Question 7

A company claims their new medication reduces headaches. In a clinical trial, the reduction is statistically significant but only by 1%. What should be considered before recommending the medication?

Accepted Answer

Whether the result has practical significance.

Question 8

Which of the following is a potential pitfall when analyzing data?

Accepted Answer

Using loaded questions in a survey.

Question 9

Suppose a survey asks, 'Do you agree that responsible citizens should vote in every election?' What is the main issue with this question?

Accepted Answer

It is a loaded question that may bias responses.

Question 10

If a study reports that 150% of students passed an exam, what is the main issue with this statistic?

Accepted Answer

Percentages over 100% are often misleading or incorrect.

Question 11

Which of the following best describes a census?

Accepted Answer

The collection of data from every member of a population.

Question 12

A study finds that 52% of 10,000 births using a certain product resulted in girls, compared to the expected 48.8%. The result is statistically significant. Why might this result lack practical significance?

Accepted Answer

The increase from 48.8% to 52% is too small to justify the product's use.

Question 13

Which of the following is NOT a step in the statistical process described in the study materials?

Accepted Answer

Guessing the results.

Question 14

In the context of the manatee fatalities and pleasure boats example, what is the main goal of the statistical study?

Accepted Answer

To determine whether there is a relationship between the number of boats and manatee deaths.

Question 15

Which of the following is the best definition of data in statistics?

Accepted Answer

Collections of observations, such as measurements, genders, or survey responses.

Question 16

A survey is conducted by mailing questionnaires to 10,000 people, but only 1,000 respond. What is the main concern with this data collection method?

Accepted Answer

Nonresponse bias may affect the results.

Question 17

Which of the following is an example of a misleading conclusion in statistics?

Accepted Answer

Claiming a treatment is effective based on a biased sample.

Question 18

If a statistical study uses data reported by subjects instead of measured by the researcher, what is a potential issue?

Accepted Answer

The data may be inaccurate due to self-reporting.

Question 19

Which of the following best describes a sample in statistics?

Accepted Answer

A subcollection of members selected from a population.

Question 20

Which of the following is a key aspect of statistical and critical thinking?

Accepted Answer

Making sense of results and using common sense in analysis.

Introduction to Statistics: Statistical and Critical Thinking, Types of Data, and Collecting Sample Data

Guida di studio - Domande di pratica

Study guide - Flashcard