Hannah has chosen to collect information using a sample instead of a census.

a

What are the advantages to doing a sample? Select all that apply.

It is cheaper to conduct.

A

There will be no sampling bias.

B

It's more accurate.

C

It takes less time.

D

It is cheaper to conduct.

A

There will be no sampling bias.

B

It's more accurate.

C

It takes less time.

D

b

What are the disadvantages to doing a sample? Select all that apply.

It's less accurate.

A

It takes more time.

B

It is more expensive to conduct.

C

There can be sampling bias.

D

It's less accurate.

A

It takes more time.

B

It is more expensive to conduct.

C

There can be sampling bias.

D

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Understand that statistics can be used to gain information about a population by examining a sample of the population; generalizations about a population from a sample are valid only if the sample is representative of that population. Understand that random sampling tends to produce representative samples and support valid inferences.

Use data from a random sample to draw inferences about a population with an unknown characteristic of interest. Generate multiple samples (or simulated samples) of the same size to gauge the variation in estimates or predictions. For example, estimate the mean word length in a book by randomly sampling words from the book; predict the winner of a school election based on randomly sampled survey data. Gauge how far off the estimate or prediction might be.