Do creative people make better salespeople? Ten sales staff in a large company were given a creativity test (scores range from 0 to 20, with higher scores indicating greater creativity) and were evaluated regarding sales growth performance (a score of 100 indicates an average performance, and larger scores indicate better performance). The creativity scores and sales growth performance scores are given below.
Creativity score Sales growth
9 93
7 89
8 95
13 101
10 102
10 96
9 95
18 111
10 103
a. What is the correlation coefficient?
b. Plot a scatterplot with the explanatory variable on the x axis.
c. Add a trendline to the scatterplot
d. What is the regression equation?
e. How much of the variability in the data is represented by the formula?