Devry university-supply chain decision tools week 2 homework

Homework

Complete the following problems from Chapter 4 in your textbook. The Homework Problems grading rubric is posted in Doc Sharing—refer to the Homework Problems Rubric document.

Chapter 4 Problems

Problem 4.24 a, b, c, and d
Problem 4.46 a, b, and c

•• 4.24

Mark Gershon, owner of a musical instrument distributorship, thinks that demand for guitars may be related to the number of television appearances by the popular group Maroon 5 during the previous month. Mark has collected the data shown in the following table:

DEMAND FOR GUITARS	3	6	7	5	10	7
MAROON 5 TV APPEARANCES	3	4	7	6	8	5

a)Graph these data to see whether a linear equation might describe the relationship between the group’s television shows and guitar sales.
b)Use the least-squares regression method to derive a forecasting equation.
c)What is your estimate for guitar sales if Maroon 5 performed on TV nine times last month?
d)What are the correlation coefficient (r) and the coefficient of determination (r²) for this model, and what do they mean?

• 4.46

Thirteen students entered the business program at Sante Fe College 2 years ago. The following table indicates what each student scored on the high school SAT math exam and their grade-point averages (GPAs) after students were in the Sante Fe program for 2 years:

STUDENT	A	B	C	D	E	F	G
SAT SCORE	421	377	585	690	608	390	415
GPA	2.90	2.93	3.00	3.45	3.66	2.88	2.15
STUDENT	H	I	J	K	L	M
SAT SCORE	481	729	501	613	709	366
GPA	2.53	3.22	1.99	2.75	3.90	1.60

a)Is there a meaningful relationship between SAT math scores and grades?
b)If a student scores a 350, what do you think his or her GPA will be?
c)What about a student who scores 800?

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