Wilmington University is concerned about the presence of grade inflation, which is defined as an increase in the average GPA of the institution’s students over time without a comparable increase in academic standards. To investigate this phenomenon, the average GPA for the student body was recorded over the past 11 years. The data are as follows and can also be found in the Excel file grade inflation.xlsx.

Year GPA Year GPA 1 3.08 7 3.08 2 2.87 8 3.00 3 2.96 9 3.19 4 2.85 10 3.15 5 2.99 11 3.15 6 3.04

a. Construct a scatter plot for these data using Excel.

b. Using a = 0.05, determine if the slope for the regression equation is statistically significant.

c. What conclusions can be drawn about grade inflation over this time period?

AppendixLO1