Quiz

 

A study was done to see the relationship between the amount of size of an e-mail address and the number of spam e-mails received per day.  The following table shows the findings:

e-mail size 13 17 17 20
spam per day 23 20 14 18

Use your calculator to find the equation of the regression line and r for this data.  Then use your results to predict the number of spam e-mail per day for an e-mail that has 18 letters.