Project #44399 - Quantitative Research Design unit 3 cont

Answer the Following Questions ( Jacskon 11 and Trochim 185-191)

1.     Jackson, even-numbered Chapter Exercises, pp. 308-310.

2. What is the difference between a randomized ANOVA and a repeated measures ANOVA? What does the term one-way mean with respect to an ANOVA?

4. If a researcher decides to use multiple comparisons in a study with three conditions, what is the probability of a Type I error across these comparisons? Use the Bonferroni adjustment to determine the suggested alpha level.

6.  When should post hoc comparisons be performed?

8. Why is a repeated measures ANOVA statistically more powerful than a randomized ANOVA?

10. In a study of the effects of stress on illness, a researcher tallied the number of colds people contracted during a 6-month period as a function of the amount of stress they reported during that same time period. There were three stress levels: minimal, moderate, and high stress. The sums of squares appear in the following ANOVA summary table. The mean  or each condition and the number of subjects per condition are also noted.

Source                df        SS        MS         F

Between groups             22.167

Within groups                14.750

Total                             36.917

 

Stress Level         Mean     N

Minimal                 3         4

Moderate                4        4

High                     6         4

a. Complete the ANOVA summary table.

b. Is Fobt significant at  = .05; at  = .01?

c. Perform post hoc comparisons if necessary.

d. What conclusions can be drawn from the

F-ratio and the post hoc comparisons?

e. What is the effect size, and what does this mean?

f. Graph the means.

12. A researcher conducted an experiment on the effects of a new“drug”on depression. The researcher had a control group that received nothing, a placebo group, and an experimental group that received the“drug.”A depression inventory that provided a measure of depression on a 50-point scale was used (50 indicates that an individual is very high on the depression variable). The ANOVA summary table appears next, along with the mean depression score for each condition.

Source                df          SS         MS        F

Between groups               1,202.313

Within groups                   2,118.00

Total                                 3,320.313

 

“Drug” Condition               Mean       n

Control                            36.26       15

Placebo                           33.33       15

“Drug”                              24.13       15

a. Complete the ANOVA summary table.

b. Is Fobt significant at  = .05; at  = .01?

c. Perform post hoc comparisons if necessary.

d. What conclusions can be drawn from the F-ratio and the post hoc comparisons?

e. What is the effect size, and what does this mean?

f. Graph the means.

14. A researcher has been hired by a pizzeria to determine which type of crust customers prefer.The restaurant offers three types of crust: handtossed, thick, and thin. Following are the mean number of 1-inch pieces of pizza eaten for each condition from 10 subjects who had the opportunity to eat as many pieces with each type of crust as they desired. The ANOVA summary table also follows:

 

Source                df         SS         MS        F

Subject                           2.75

Between                       180.05

Error                              21.65

Total                              204.45

 

Crust Type                       Mean      n

Hand-tossed                    2.73 10

Thick                                4.20 10

Thin                                  8.50 10

a. Complete the ANOVA summary table.

b. Is Fobt significant at  = .05; at  = .01?

c. Perform post hoc comparisons if necessary.

d. What conclusions can be drawn from the F-ratio and the post hoc comparisons?

e. What is the effect size, and what does this mean?

f. Graph the means.

 

 

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