Question 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:
2 3 4 5 6 7 8 9
grade 98 77 88 80 96 61 66 95 69
average 93 78 84 73 84 64 64 95 76
Develop a regression model that could be used to predict the final average in
the course based on the first test grade.
Predict the final average of a student who made an 83 on the first test.
the values of r and for this model. Interpret the value of in the context of
4-14: Using the data in Problem 4-13, test to see if there is a statistically
significant relationship between the grade on the first test and the final
average at the 0.05 level of significance. Use the formulas in this chapter and
Using computer software, find the least squares regression line
for the data in Problem 4-13. Based on the F test, is there a statistically
significant relationship between the first test grade and the final average in
4-19: Bus and subway ridership in Washington, D.C., during the summer months is
believed to be heavily tied to the number of tourists visiting the city. During
the past 12 years, the following data have been obtained:
1 7 15 2
2 10 3 6 13 4 4 15 5 14 25 6 15 27 7 16 24 8 12 20 9 14 27 10 20 44 11 15 34 12
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