Unit 6 Statistics Review

Front

What percent of data falls within 2 standard deviations of the mean in a normal distribution?

Back

95% of data falls within 2 standard deviations of the mean in a normal distribution.

Front

What type of research involves manipulating variables to determine cause and effect?

Back

Experiment.

Front

What is the shape of a distribution that has a longer tail on the right side?

Back

Skewed right.

Front

In a normal distribution with a mean of 69 inches and a standard deviation of 2.5 inches, what percent of men are between 64 and 66.5 inches tall?

Back

13.5%.

Front

What type of study involves observing subjects in their natural environment without manipulation?

Back

Observational study.

Front

What is the mean in a data set?

Back

The mean is the average of all data points in a set.

Front

What does standard deviation measure in a data set?

Back

Standard deviation measures the amount of variation or dispersion of a set of values.

Front

What is a normal distribution?

Back

A normal distribution is a probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence.

Front

What is the empirical rule in statistics?

Back

The empirical rule states that for a normal distribution, approximately 68% of the data falls within 1 standard deviation, 95% within 2 standard deviations, and 99.7% within 3 standard deviations.

Front

What is the difference between a sample and a population?

Back

A sample is a subset of a population used to represent the whole.