Module 6: Homework Assignment 30 pts.
Respond to the prompt(s) for each item below using complete sentences and clear writing. You may single-space your work. A cover page or page numbers are not required. Cite and reference only where indicated unless you utilize outside sources in a response. Please do item 1,2,3 only
Return to the assignment page when you are ready to submit your assignment.
Collaboration on this assignment is NOT allowed. Your work must be your own.
Item 1 (2 pts.)
What do p-values and effect sizes tell us about the significance of our results? Be sure to comment on any similarities or differences between the two.
Item 2 (5 pts.)
Explain the relationships between ...
A. Sample size and Confidence intervals (1 pt.)
B. Power and Effect size (1 pt.)
C. Sample size and Power (1 pt.)
D. Power and Type II Error (1 pt.)
E. Alpha and Power (1 pt.)
Item 3 (7 pts.)
Use the following scenario to respond to parts A - D.
Nancy compares the effectiveness of two forms of psychotherapy against a control group (no therapy) for obsessive compulsive disorder. The IV and DV are listed below: IV = Therapy Condition (Therapy A, Therapy B, No Therapy)
DV = Effectiveness Score (pre-to-post reduction in symptoms)
Nancy sets the hypotheses as follows:
H0 = There are no differences among the mean effectiveness scores of groups. Ha = There are statistically significant differences among the mean effectiveness scores of groups.
A. Explain what it would mean in this scenario if Nancy were to commit a Type I error. (2 pts.)
B. Explain what it would mean in this scenario if Nancy were to commit a Type II error. (2 pts.)
C. If the results of the data analysis support the alternative hypothesis, what was Nancy's decision about the null hypothesis? (1 pt.)
D. If the results of the data analysis support the alternative hypothesis, is the following statement appropriate? Explain. (2 pts.) Therapy A is more effective than Therapy B which is more effective than having no treatment.
USE THE FOLLOWING SCENARIO TO ANSWER ITEMS 4 AND 5:
Jack wants to investigate the mean differences between middle-aged adults and older adults on a quantitative measure of life satisfaction (0 - 7 scale). Jack expects that life satisfaction will differ between the age groups.
Item 4 (6 pts.)
A. What is the more appropriate statistical test for him to use and why? (2 pts)
B. Explain power within the context of this study. Be sure to reference null and alternative hypotheses in your explanation. (4 pts.)
Item 5 (10 pts.)
After running the appropriate statistical tests, Jack finds that life satisfaction was in the older adults (M = 4.9, SD = 1.2) than in middle-aged adults (M = 4.1, SD = 1.8), t(58) = 2.03, p = . 047, 95% CI [0.01, 1.59], d = . 52.
A. From these statistical results, what conclusions can Jack make? Comment on whether there are statistically significant differences between the groups and how you know. (2 pts)
B. What should Jack decide about the hypotheses? State the decision and explain what the decision means in the context of this study. (2 pts.)
C. What does the "t(58) = 2.03" tell us? (2 pts.)
D. What can we conclude from the confidence interval within the context of this study? (2 pts)
E. What does the effect size tell us within the context of this study? (2 pts)/nModule 6: Homework Assignment
30 pts.
Respond to the prompt(s) for each item below using complete sentences and clear writing. You may single-space your work. A cover page or page numbers are not required. Cite and reference only where indicated unless you utilize outside sources in a response. The weekly homework assignment requires very thorough and detailed answers. These are not 1-2 sentence responses. Please take your time and
be sure to elaborate on all your answers.
Min word count:500
APA format mandatory
Return to the assignment page when you are ready to submit your assignment.
Collaboration on this assignment is NOT allowed. Your work must be your own.
Item 1
Item 2
Item 3
