Understanding Populations and Samples Quiz

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| By Thames
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Thames
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Quizzes Created: 7252 | Total Attempts: 9,525,313
| Questions: 20 | Updated: Nov 16, 2025
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1) A school principal wants to know the average number of books students read per year in the entire school. Which is the population?

Explanation

The population is the whole group you care about → here, all students in the school.

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About This Quiz
Understanding Populations And Samples Quiz - Quiz

This quiz focuses on the basic concepts of populations and samples, and the differences between them. You'll explore how researchers select samples from populations and why sampling is essential for making reliable inferences about larger groups. You will also learn about population parameters and sample statistics.

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2) A survey asks 200 randomly selected city residents about commute time to estimate the city's average commute time. What is the sample?

Explanation

The sample is the smaller group actually surveyed → the 200 residents.

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3) Which scenario best describes a population parameter?

Explanation

A parameter is a true value for the entire population.

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4) Why do researchers use samples instead of surveying entire populations?

Explanation

Sampling saves time and money.

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5) Which is the best reason to use a random sample?

Explanation

Random sampling helps make the sample representative.

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6) A team wants to estimate the average height of oak trees in a forest. Which is the best method?

Explanation

Randomly measuring trees across the forest gives a fair picture.

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7) Which is an example of a biased sample?

Explanation

People at a gym are likely to exercise more.

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8) A researcher studies the average screen time of teenagers... goal?

Explanation

We use the sample to estimate the population.

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9) Which statement is true about populations and samples?

Explanation

A sample is a smaller part.

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10) A school district wants to know the percentage of students who prefer online homework. Which is a parameter?

Explanation

A parameter is the true value.

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11) Which plan describes the population?

Explanation

Plan A uses all 9,600 students.

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12) Which plan is most likely to produce a representative sample?

Explanation

Plan B randomly surveys students.

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13) Which plan is most likely to introduce voluntary response bias?

Explanation

Plan C uses volunteers from social media.

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14) Which plan is most likely to overrepresent students from a single environment?

Explanation

Plan D surveys only one school.

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15) Which sample is most likely to be biased high for extracurricular hours?

Explanation

Sample Y is from a competitive sports event.

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16) Which sample is most likely to be representative?

Explanation

Sample X uses a random household mailing list.

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17) Which statement is most accurate about Sample Z?

Explanation

Sample Z includes only two schools.

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18) A parameter is to a population as a statistic is to a:

Explanation

A statistic is from a sample.

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19) A university wants the average GPA... sample statistic?

Explanation

The sample statistic is the mean of sampled students.

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20) Which statement best summarizes the purpose of sampling?

Explanation

We sample to learn about the population.

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A school principal wants to know the average number of books students...
A survey asks 200 randomly selected city residents about commute time...
Which scenario best describes a population parameter?
Why do researchers use samples instead of surveying entire...
Which is the best reason to use a random sample?
A team wants to estimate the average height of oak trees in a forest....
Which is an example of a biased sample?
A researcher studies the average screen time of teenagers... goal?
Which statement is true about populations and samples?
A school district wants to know the percentage of students who prefer...
Which plan describes the population?
Which plan is most likely to produce a representative sample?
Which plan is most likely to introduce voluntary response bias?
Which plan is most likely to overrepresent students from a single...
Which sample is most likely to be biased high for extracurricular...
Which sample is most likely to be representative?
Which statement is most accurate about Sample Z?
A parameter is to a population as a statistic is to a:
A university wants the average GPA... sample statistic?
Which statement best summarizes the purpose of sampling?
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