Question: A computer software developer would like to use the number of downloads (in thousands) for the trial version of his new shareware to predict the

A computer software developer would like to use the number of downloads (in thousands) for the trial version of his new shareware to predict the amount of revenue (in thousands of dollars) he can make on the full version of the new shareware. Following is the output from a simple linear regression along with the residual plot and normal probability plot obtained from a data set of 30 different sharewares that he has developed:

What is the critical value for testing whether there is a linear relationship between revenue and the number of downloads at a 5% level of significance?

What do the lower and upper limits of the 95% confidence interval estimate for population slope?

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