(Computer software required.) Find two variables that are both changing over time. A good source is government data available at the website fedstats.gov.Record the values of the two variables for at least eight time periods (such as years).
a. Create a scatterplot of the data, and comment on the relationship.
b. Find the correlation between the two variables. Then find the correlation between each variable and year (or whatever time period you are using). Comment on whether you think there is an important relationship between the two variables, or if they are related only because they have both changed over time.