AP Stats Midterm Review

Front

What is the correlation coefficient?

Back

A statistical measure that describes the strength and direction of a relationship between two variables. Values range from -1 to 1.

Front

What is Voluntary Response Bias?

Back

A type of bias that occurs when individuals select themselves to participate in a survey, often leading to unrepresentative samples.

Front

What is the mean in statistics?

Back

The average of a set of numbers, calculated by dividing the sum of all values by the number of values.

Front

What does a standard deviation indicate?

Back

A measure of the amount of variation or dispersion in a set of values.

Front

What does it mean if a histogram is skewed left?

Back

It indicates that the left tail of the distribution is longer or fatter than the right tail, suggesting that most data points are concentrated on the right.

Front

What is a Cluster Sampling method?

Back

A sampling method where the population is divided into clusters, and entire clusters are randomly selected for the sample.

Front

What is a Unimodal distribution?

Back

A distribution with a single peak or mode.

Front

What is the significance of the 95% confidence interval?

Back

It indicates that if we were to take many samples and build a confidence interval from each sample, approximately 95% of those intervals would contain the true population parameter.

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 subset of the population used to represent the group.

Front

What is Undercoverage in sampling?

Back

A type of bias that occurs when some members of the population are inadequately represented in the sample.