Computer with SPSS

MARKING INFORMATION

Marks per question are as indicated (100 marks in total).

GENERAL INFORMATION

For all tests assume that p < 0.05 is required for statistical significance.

?1. The following data represents the average height of players in a football tournament as well as the number of goals scored in the competition. Calculate if there is a relationship between height and goals scored. (7 marks total) 

     Team      Average height of Goals scored

players (cm)

1. Which test was run and why? Comment on normality. (2 marks)
2. Calculate the association between the average height and the number of goals scored during the competition and provide your conclusion. (3 marks)
3. What is the coefficient of determination? (2 marks)

2? . The following scores were obtained from the same set of students who performed a quiz in the first week of the semester and the same quiz in the last week of the semester: (7 marks)  

Quiz 1Quiz 2

   11        21

   10        13

    6          28

   12        36

   16        65

   21        87

   45        46

   51        76

   60        89

   82        99

1. State the test you selected for the analysis and why this test was chosen (report on normality).

(3 marks)

2. Determine if there is a difference between the first and second skills tests and state your conclusion.  (4 marks)

3? .  The following glutamate levels were measured from individuals with schizophrenia, major depressive disorder, and non-psychiatric controls: (12 marks)

SchizophreniaDepressionControl

Assuming that your data is normally distributed:

1. Provide the means and SD for the schizophrenia, depression, and controls groups (3 marks)
2. Is there a difference in glutamate across the groups (state your results)? (3 marks) 
3. If there is a difference, locate the source of the differences (and state what test you used) (4 marks)
4. If there is a difference, what is the magnitude of change between:

i. Schizophrenia and controls? (1 mark) ii.   Depression and controls? (1 mark)

?For the following 6 questions, use the Exam Data 1 dataset

4. You have been asked to examine the relationship between week 6 weight and week 6 bench press controlling for age. Assume data is normally distributed. (7 marks total)
   1. Determine what test to perform (state test used), explain why you used this test (3 marks)
   2. Identify if there is an initial relationship between week 6 weight and week 6 bench press and report your results (2 marks)
   3. Determine if there is a relationship between week 6 weight and week 6 bench press after controlling for age and state your finding? (2 marks)

5. Is there a difference in height between males and females? Assume data is normally distributed. (4 marks total)
   1. State the test used and why you would use this test (1.5 mark)
   2. State your results (2.5 marks)

6. Determine if there was a change in speed of the 1km run time (include all subjects) from baseline to week 12. (6 marks total)
   1. State the test used and why (2.5 marks)
   2. State your results (2 marks)
   3. State your conclusion. (1.5 mark)

?7. As part of your honours paper you need to construct a table of subject characteristics for age, height, weight, baseline fat mass, CRP baseline, and history of psychotropic medication between the low and high intervention groups. (12 marks total)

1. Construct your table (do not paste from SPSS) and show the mean and SD (or percentages/ratios if applicable) (6 marks)
2. Report the p-values for the group comparison (6 marks)  

Assume data is normally distributed.

?8. For women only, determine if fat mass changed over the 3 time points (baseline, week 6, and week 12) and, if it did change, locate the source of the differences. Assume that the data is normally distributed. (11 marks total)

1. State what test you chose and why it was selected. (3 marks)
2. What were your initial findings? (5 marks)
3. Report the source of the difference (1 mark)
4. If there is a difference between time points what is the magnitude of change? (Pick one difference to calculate only) (2 marks)

9. You want to test if the intervention influenced CRP levels between men and women but noticed that there was a significant correlation between age and week 12 CRP levels. As a result, you decided that you should control for age in your analysis. Undertake the analysis to determine if there was a difference between male and female week 12 CRP levels, considering the impact of age in your analysis (assume that your data is normally distributed). (8 marks total)

1. State the test used and what your covariate was (3 marks)
2. Was there a significant gender difference? What is your conclusion? (3 marks)
3. Provide the adjusted CRP levels. (2 marks)

?10.  Is there an interaction between gender and intervention group on week 12 bench press? Furthermore, report on any main effects of gender and the intervention groups. Assume data is normally distributed.(9 marks total)

10. 1. What test did you use and why? (2 marks)
    2. What was the overall result? (4 marks)
    3. Were there any main effects? Report on all results (3 marks)
11. You want to compare differences in systolic blood pressure across the three interventiongroups. Conduct the appropriate analysis and report on your findings. (10 marks total)
    1. What test did you perform and why? Comment on normality of the data (3.5 marks)
    2. Was there a significant difference? (3.5 marks)
    3. If there was a difference, locate the source of the difference (3 marks)

12. A recent publication assessed the association of performing weekly crosswords and developing Alzheimer’s Disease.  Study design – prospective cohort (5 years)

Participants – 3,488 people without Alzheimer’s Disease

Exposure – Completing crosswords (categorized as either yes or no) Outcome – Alzheimer’s Disease

Results:

Did crosswords = 665 people, number with Alzheimer’s = 22

Didn’t do crosswords = 2823 people, number with Alzheimer’s = 120 (7 marks total)

1. 1. Determine the association between crosswords and Alzheimer’s disease (2 marks)
   2. Show your work (i.e., show your 2 x 2 contingency table) (3 marks)
   3. Interpret your finding (what does it indicate) (2 marks)