Project #51285 - Statistics Final

Psyc 303/304                                                           Fall  2014

 

Final Exam

Statistics Component

 

Instructions:  For each problem, perform the appropriate statistical test and report the findings (Do NOT simply report –“Reject or Fail to Reject Null Hypothesis”).  Write a min-Results section for each problem.

 

Include descriptive stats – Mean and SEM. Also, BE SURE to FIRST describe the type of research design being used along with the IV and DV.  Show all work for full credit.  Possible Stats:  t-test for independent samples, t-test for dependent samples, regression analysis, ANOVA (one-way BS or two-way BS or mixed) Use α = 0.05 for all tests.

 

  1. A psychologist interested in the relationship between stress and short-term memory tests ten subjects prior to and after their exposure to a stressful situation. Test the hypothesis that Stress affects Short-term memory.

Prestress – 12, 14, 10, 14, 14, 17, 16, 11, 12, 16

Poststress- 11, 14, 8, 15, 11, 14, 16, 9, 11, 13

 

  1. A Ramapo College Psychology major is interested in predicting levels of

depression from the number of social events attended per week for a sample of Ramapo College students. Determine if there is a relationship between depression and social events attended. Is this relationship significant?

 

Student

Social Events Attended/Week

Depression Score

1

0

15

2

2

3

3

2

12

4

1

11

5

3

5

6

1

8

7

2

15

8

0

13

9

3

2

10

3

4

11

4

2

12

1

8

13

1

10

14

1

12

15

2

8

 

 

 

  1. A marketing analyst is assessing the effectiveness of two types of formats for TV commercials. Twenty-four regular TV watchers are randomly selected and then assigned to watch one of the two formats of a commercial for a given SUV. The following data are scores on a measure of commercial impact. Test the hypothesis that Format B entices people to want to buy the SUV. 
    Hint: There are two ways to do this analysis. Do BOTH!!!!

 

Format A: 21 33 40 37 22 25 39 28 34 25 27

Format B: 38 32 56 58 45 46 57 49 43 41 55

 

 

  1. At Microsoft Inc., a survey of job satisfaction is given to separate random samples of labor and management representatives. These surveys are conducted three times a year. Each time a new sample is selected. The following data are job satisfaction scores for the samples at different times. Test to determine if Labor and Management differ on job satisfaction. How could you determine if job satisfaction fluctuated depending on time of year for each Labor and Management?

             

                           TIME

 

1

2

3

18

15

11

Labor t-test for independent sample

 

18

17

15

 15

18

14

  17

14

15

19

14

10

 

 

 

20

18

16

Management

 

20

17

16

18

20

18

15

15

12

17

15

15

 

 

 How many t-tests would need to be used to analyze this data set?

 What is the problem with this approach?

 

 

 

 

  1.  Going back to our RPI experiment, what type of research design would that be,considering both groups?  In other words, if asked to analyze that data on SPSS, how would you accomplish this? 

 

    For the Take-Home part… simply answer the questions (A-C)

 

A.)   Provide IV, DV and Research Design.  Provide a brief rationale for

your choice of design.

    

     B). In terms of Statistical Power, why is a within-subjects design

           generally more powerful than a between-subjects design?

 

     C). Regardless of research design, what is the BEST method to

           Increase statistical power and why is power important?

      

 

Extra Credit – worth 5% of Stats Final

 

     D). Using the data from the RPI experiment perform the appropriate

           analysis (with Post-Hoc tests, if necessary) on SPSS.

Subject Mathematics
Due By (Pacific Time) 12/11/2014 01:00 pm
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