Question: The following table gives the mean download times (in seconds) for files of various sizes (in kilo-bites) as computed by an Internet Service Provider.

Time Size

a. Use your calculator or statistical software to sketch the scatter plot for this data. Does there appear to be a correlation between the variables? If so describe the correlation.

b. Determine the correlation coefficient (r) between variables.

c. With = 0.05, test the statistical significance of r in (b) above. d. What is value of r2 and what does it tell you?

e. Find the regression equation for this data

f. Use the regression equation to predict (forecast) the expected download time of a file that is 100 kilobites in size.