Question 1

A researcher wants to estimate the average height of all adult males in a city. She randomly selects 200 men and calculates their average height. Which term best describes the average height calculated from these 200 men?

Accepted Answer

Statistic

Question 2

Which of the following is an example of qualitative data?

Accepted Answer

A student's eye color

Question 3

A survey asks respondents to rate their satisfaction with campus facilities as 'Poor', 'Fair', 'Good', or 'Excellent'. What is the level of measurement for this data?

Accepted Answer

Ordinal

Question 4

Which sampling method is most likely to introduce bias?

Accepted Answer

Convenience sample

Question 5

A scientist records the temperature in degrees Celsius every hour for a week. What is the level of measurement for this data?

Accepted Answer

Interval

Question 6

Which of the following best describes a census?

Accepted Answer

Collecting data from every member of the population

Question 7

A researcher divides a hospital's patients into groups based on their medical condition and then randomly selects patients from each group. Which sampling method is being used?

Accepted Answer

Stratified sample

Question 8

Which of the following is an example of continuous data?

Accepted Answer

Time taken to run a marathon

Question 9

A teacher records the final grades of students as A, B, C, D, or F. What is the level of measurement for this data?

Accepted Answer

Ordinal

Question 10

In a study, researchers apply a new drug to one group of patients and a placebo to another, then compare the outcomes. What type of data collection method is this?

Accepted Answer

Experiment

Question 11

Which of the following statements about descriptive statistics is TRUE?

Accepted Answer

Descriptive statistics involve organizing, summarizing, and presenting data.

Question 12

A researcher selects every 10th person from a list after randomly choosing a starting point. Which sampling method is this?

Accepted Answer

Systematic sample

Question 13

Which of the following is an example of a parameter?

Accepted Answer

The mean height of all adults in a country

Question 14

A simulation is most useful when:

Accepted Answer

It is impossible or impractical to collect real-world data

Question 15

Which of the following is NOT a source of nonsampling error?

Accepted Answer

Random variation due to chance

Question 16

A university wants to estimate the average GPA of its students. It divides students by major and randomly selects students from each major. Which sampling method is used?

Accepted Answer

Stratified sample

Question 17

Which of the following best describes inferential statistics?

Accepted Answer

Drawing conclusions about a population based on sample data

Question 18

A researcher wants to study the effect of a new fertilizer on plant growth. She randomly assigns some plants to receive the fertilizer and others to receive none, then measures their growth. Which method of data collection is used?

Accepted Answer

Experiment

Question 19

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

Accepted Answer

Height in centimeters

Question 20

A researcher divides a city into neighborhoods and randomly selects several neighborhoods, then surveys all residents in those neighborhoods. Which sampling method is this?

Accepted Answer

Cluster sample

Introduction to Statistics: Key Concepts and Foundations

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