Question: Answer the following questions using the data from the Excel file grade inflation by semester.xlsx described in Problem 16.41: a. Forecast the average GPA for

Answer the following questions using the data from the Excel file grade inflation by semester.xlsx described in Problem 16.41:

Year GPA Year GPA 2010 2.94 2014 2.85 2011 2.82 2015 3.08 2012 2.90 2016 3.15 2013 2.96 2017 3.10


a. Forecast the average GPA for each semester during 2018 using a multiple regression with seasonal dummy variables.

b. Interpret the meaning of the coefficients for the seasonal dummy variables.

c. Calculate the MAD for this forecast.

Year GPA Year GPA 2010 2.94 2014 2.85 2011 2.82 2015 3.08 2012 2.90 2016 3.15 2013 2.96 2017 3.10

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