|
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 |
| New search. (Also 1294 free access solutions) |