It is coming to the end of the fiscal year and you have to decide whether to continue to lease the PCs in the company or buy new ones. The current lease agreement is for $20/per month per machine with


Exam 1 Makeup


You can earn up to 10 points on your Exam 1 grade. This is due to me by Thursday, October 10 at 3 pm. Use your notes! I purposely gave you problems you had difficulty with on Exam 1.


Researchers are interested if two popular diet pills on the market work equally well for people of normal weight and people who are overweight. Participants classified as normal or overweight were randomly assigned to take either Diet Pill A or Diet Pill B for 4 weeks. The number of pounds they lost in that 4 week period was measured.

Diet Aid

Pill A

Pill B

Weight

Normal

Overweight

10

1. Evaluate the table above. Are there main effects of Diet Aid or Weight? Is there an interaction? Write your conclusions as you would in a formal paper.

How does type of evidence and type of case influence likelihood of guilt judgments? Participants are randomly assigned to read either about a rape case or murder case. The type of evidence presented at the trial was manipulated so that participants read about either DNA evidence, eyewitness evidence, or both. Likelihood of guilt judgments (on a scale from 1-9) was measured.

Evidence

Type of Case

DNA

Eyewitness

Both

Means

Rape

Mean

8.0

5.6

8.2

7.27

Murder

Mean

4.8

7.6

7.4

6.60

Group Means

6.40

6.60

7.80

6.93

2. Complete the Summary Table.

Source

SS

df

MS

F

C (Case)

E (Evidence)

CE

Error

Total

3. What are your conclusions? Be specific (i.e., if there are significant differences, specify the direction). If follow-up comparisons are necessary, use Tukey’s HSD test.

4. Calculate the simple effects for Case Type at each level of Evidence. Which are significant? INDICATE THE CRITICAL F YOU USED.

Source

SS

df

MS

F

C at DNA

C at Eyewitness

C at Both

Error

5. Calculate omega squared for each main effect and the interaction. Interpret what these values mean.