PUBH 6033—Week 7 Assignment 1
Comparing two means: When drink drove a Student to statistics
(Rubric included)
Instructions
For this assignment, you review this week’s Learning Resources and then perform a twosample independent ttest and an ANOVA related to the dataset that was utilized in the week 2 SPSS application assignment. Import the data into SPSS; or, if you correctly saved the data file in week 2, you may open and use that saved file to complete this assignment. Type your answers to all questions directly into the worksheet, and paste the required output at the end of this document.
Submit this Application Assignment by Day 7.
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Research Scenario
A study was conducted to determine if a walking plus strength training exercise program results in a significantly greater increase in aerobic capacity as compared to a walking only exercise program. Participants are randomly selected and then randomly assigned to one of the exercise groups. Participants’ aerobic endurancewas assessed at the beginning of the study and, again, after 6months of exercise.
Coding for study variables:
 AGE—age in years
 SEX—1 =male, 2=female
 EXERCISE—1= walking and strength training; 2 = walking;
 CHNG_ENDUR—change in maximal oxygen uptake (liters per minute)from pretest to posttest
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Note: Save all of your SPSS output. You will paste copies in steps 79, below.
Step 1:Review this week’s Learning Resources.
Step 2: Import the Microsoft Excel data file provided in this week’s learning resources into SPSS (or open saved file from week 2 application assignment).
Step 3:Run and save the Codebook for your SPSS data file
Step 4: Conduct an independent samples ttest to determine if there is a difference between the exercise type 1 and 2 in terms of changes in maximal oxygen uptake. Note that the independent variable is EXERCISE, and the dependent variable is CHNG_ENDUR.For this analysis, choose a twotailed test of significance.
Step 5: Conduct a betweensubjects ANOVA to determine if there is a difference between sex (males vs. females) and CHNG_ENDUR. Note that the independent variable is SEX, and the dependent variable is CHNG_ENDUR. For this analysis, choose a twotailed test of significance.
Step 6: Review your SPSS output and answer each of the following questions:
QUESTION  type answers below  Score (to be entered by instructor) 
From the independent samples ttest output:  
1. What is the mean CHNG_ENDUR for group 1?  ________________  ____/3points 
2. What is the CHNG_ ENDUR standard deviation for group 1?  ________________  ____/ 3 points 
3. What is the mean CHNG_ENDUR for group 2?  ________________  ____/ 3 points 
4. What is the CHNG_ ENDUR standard deviation for group 2?  ________________  ____/ 3 points 
5. What is the value of the tstatistic (equal variances assumed)?  ________________  ____/ 3 points 
6. What is the probability that the obtained tstatistic was simply due to chance as opposed to actual exercise type differences [see “Sig (twotailed)” on output]?  ________________  ____/ 3 points 
7. Are the results statistically significant at alpha = 0.05 (yes or no)?  ________________  ____/ 3 points 
8. Based on the results, do you reject or fail to reject the null hypothesis?  ________________  ____/ 3 points 
From the ANOVA output:  
9. What is the mean CHNG_ENDUR for males?  ________________  ____/ 3 points 
10. What is the CHNG_ENDUR standard deviation for males?  ________________  ____/ 3 points 
11. What is the mean CHNG_ENDUR for females?  ________________  ____/ 3 points 
12. What is the CHNG_ENDUR standard deviation for females?  ________________  ____/ 3 points 
13. What is the calculated Fvalue?  ________________  ____/ 3 points 
14. What is the probability (noted as “Sig” on output) that the obtained Fvalue was simply due to chance as opposed to actual gender differences?  ________________  ____/ 3 points 
Step 7: Paste the SPSS Codebook output below.
Step 8: Paste the independent samples ttest outputbelow.
Step 9: Paste the ANOVA output below.
Section below (scoring) is to be completed by Instructor
Scoring Rubric for week 2 assignment1—Hands on SPSS(60 points)
Timeliness

Fully Met

Partially Met/Good  Partially Met/Fair  Not Met 
Timeliness Indicators  Posted by the deadline  Posted 1 day late  Posted 24 days late  Posted five or more days late 
Grade impact  No impact  10% reduction in overall assignment score  20% reduction in overall assignment score  0 points 
Questions

14 questions (worth 3points each)
____ / 42 points possible

SPSS Output

Three SPSS outputs (6 points each) ____ / 18 points possible

Initial Score (60 possible points):
Timeliness Factor (late points deducted):
Total Score (60 possible points):
Instructor comments: