Business Analysis
Autor: Yu Zhang • February 13, 2019 • Case Study • 255 Words (2 Pages) • 352 Views
Submitted by: Team 7--- Marc Manaol & Zhang Yu Date: Feb 13, 2019 Chapter 4
4-13 Students in a management science class have just received their grades on the first test. The instructor has provided information about the first test grades in some previous classes as well as the final average for the same students. Some of these grades have been sampled and are as follows:
Student | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
1st test grade | 98 | 77 | 88 | 80 | 96 | 61 | 66 | 95 | 69 |
Final average | 93 | 78 | 84 | 73 | 84 | 64 | 64 | 95 | 76 |
a) Develop a regression model that could be used to predict the final average in the course based on the first test grade.
b) Predict the final average of a student who made an 83 on the first test.
c) Give the values of r and r2 for this model. Interpret the value of r2 in the context of this problem.
Solutions：
By applying Least Squares- Simple and Multiple Regression method and using the PM for windows to get the relevant data for creating a regression model, we get following results:
[pic 1][pic 2]
a) Slope = 0.74 Intercept = 18.989
Regression Equation: Y= 0.74X + 18.989
b) By applying the regression model created above, when 1st test grade X = 83
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