(Solution) - A researcher collects the data shown at the left and -(2025 Original AI-Free Solution)

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A researcher collects the data shown at the left and concludes that there is a significant relationship between the amount of radio advertising time (in minutes per week) and the weekly sales of a product (in hundreds of dollars). Find the standard error of estimate. Use the regression equation
 = 1.405x + 7.311
a. Use a table to calculate the sum of the squared differences of each observed y-value and the corresponding predicted y-value.
b. Identify the number n of pairs of data.
c. Calculate se.
d. Interpret the results.
Radio ad time, x Weekly sales, y
15 ?????????? 26
20 ?????????? 32
20 ?????????? 38
30 ?????????? 56
40 ?????????? 54
45 ?????????? 78
50 ?????????? 80
60 ?????????? 88