Stat week 3

Moving Average

Susan Armstrong is a college student who has just completed her junior year. The table below summarizes her Grade Point Average (GPA) for each of the last nine semesters. Susan would like to forecast her Fall semester of her senior year using a three-period moving average.

Year Semester GPA Freshman Fall 2.2

Winter 2.7 Spring 2.5

Sophomore Fall 2.4 Winter 3.0 Spring 2.7

Junior Fall 2.5 Winter 3.6 Spring 3.2

a. What is her forecast for Fall semester? b. What is the MAD?