3. You are given the same test scores (x) and weekly sales (y) data as in problem 7a. Salesperson Test Score (x) Weekly Sales (y)-in thou. of dollars 1. Mr. Amber $6 2. Mr. Archer WNA $12 3. Ms. Smith $4 4. Mr. Malcolm $8 5 Ms. Goodwin 10 $11 What is the regression equation that can be estimated from this data? (i.e., of the form y'=a+by where y stands for predicted.) What is the standard error of the estimate? Construct 90% confidence intervals for the mean value of y given that x=4