Pre3

In describing a dataset, what does the mean represent?

(Usually) The arithmetic average.

What is the difference between a categorical and continuous variable?

Categorical are assigned to discrete categories; continuous can take any value in a range.

What is a scatterplot?

A graph where both the explanatory and response variables are continuous.

In describing a dataset, what does the standard deviation or standard error represent?

A measure of the variation around the estimate of the mean.

What is the difference between an explanatory (or independent) variable and a response (or dependent) variable?

Explanatory is the factor that varies in an experiment; response is measured as the explanatory variable varies.

What is a bar plot, and what do the vertical lines on a bar plot represent?

The height of a bar represents a mean; the vertical line usually represents the standard error.