Samples and Margin of Error

Front

What is a sample in statistics?

Back

A sample is a subset of a population used to represent the entire group in statistical analysis.

Front

Why is a larger sample size preferred in surveys?

Back

A larger sample size reduces the margin of error, leading to more accurate results.

Front

What is margin of error?

Back

Margin of error is a statistic that expresses the amount of random sampling error in a survey's results.

Front

How can bias be reduced in sampling?

Back

Bias can be reduced by increasing randomness in the selection of the sample.

Front

What does a margin of error of 7% indicate?

Back

It indicates that the true value is likely within 7 percentage points above or below the reported percentage.

Front

If a survey reports 89% with a margin of error of 2%, what is the confidence interval?

Back

The confidence interval is 87% to 91%.

Front

What is the difference between a population and a sample?

Back

A population includes all members of a specified group, while a sample is a smaller group selected from the population.

Front

What is the purpose of random sampling?

Back

The purpose of random sampling is to ensure that every individual has an equal chance of being selected, reducing bias.

Front

What does it mean if a survey has a 95% confidence level?

Back

It means that if the same survey were conducted multiple times, 95% of the time the results would fall within the margin of error.

Front

How does sample size affect the reliability of survey results?

Back

Larger sample sizes generally lead to more reliable results with smaller margins of error.