Statistics advance

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QMB 500-N

STATISTICS FOR DECISION MAKERS

Critical Thinking Exam 4 Name: ___________________

March 31, 2016 Grade: _________

This is a take-home exam. The rules are as follows:

1. This is to be your own work. You may not consult with anyone, except the Professor, regarding

these problems.

2. You may not consult any references other than your text, your class notes from this course,

material on the course’s Blackboard site and your assignments.

3. Show all work leading to your answer in a clear and organized fashion. Write down your

answers explicitly. No Work means No Credit.

4. This exam is due at the beginning of class on Thursday, April 7, 2016. All work must be

submitted in both hard copy and electronically on Bb in the Assignments area except if written by

hand (no need to scan). Original file formats only. No PDF!

5. I, _________________________, certify that, by submitting this cover page, I completed

all work according to rules 1-4, and that I did not copy nor use anyone else’s ideas or work

to complete this exam. I also certify that I will not share this exam or my work on this exam

with anyone else now or in the future. Signature____________________________________

Short Answer Essays (5 points each)

1. What is the interpretation of the Y-intercept and the slope in a simple linear regression model?

2. What is the interpretation of the coefficient of determination in a simple linear regression model?

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3. What is the interpretation of the Y intercept and the slopes in a multiple regression model?

4. What is the interpretation of the coefficient of multiple determination?

5. What is the interpretation of the Adjusted r2?

6. What is the interpretation of the coefficient of partial determination?

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Problem 1

Consider the Digital Case on page 518 of your text. Answer all case questions. Please make sure

that you attach all relevant Excel/PHStat outputs and that you explain them thoroughly.

Q1. (23 points)

Q2. (4 points)

Q3. (4 points)

Q4. (4 points)

Problem 2

Consider the Digital Case on page 567 of your text. Answer all case questions. Please make sure

that you attach all Excel/PHStat outputs and that you explain them thoroughly.

Q1. (27 points)

Q2. (4 points)

Q3. (4 points)