1 A published report of a repeatedmeasures research study in

A published report of a repeated-measures research study includes the following

description of the statistical analysis. “The results show significant differences among the

treatment conditions, F(2,20) = 5.00, p< .05.”

a. How many treatment conditions were compared in the study?

b. How many individuals participated in the study

A recent study examined how applicants with a facial blemish such as a scar or birthmark

fared in job interviews (Madera & Hebl, 2011). The results indicate that interviewers

recalled less information and gave lower ratings to applicants with a blemish. In a similar

study, participants conducted computer-simulated interviews with a series of applicants

including one with a facial scar and one with a facial birthmark. The following data

represent the ratings given to each applicant.

Applicant

Participant Scar Birthmark No Blemish Person Totals

A 1 1 4 P = 6

B 3 4 8 P = 15 N = 15

C 0 2 7 P = 9 G = 45

D 0 0 6 P = 6 X² = 231

E 1 3 5 P = 9

M=1 M=2 M=6

T=5 T=10 T=30

SS=6 SS=10 SS=10

a. Use a repeated-measures ANOVA with =.05 to determine whether there are

significant mean differences among the three conditions.

b. Compute ², the percentage of variance accounted for by the mean differences, to

measure the size of the treatment effects.

c. Write a sentence demonstrating how a research report would present the results of

the hypothesis test and the measure of effect size.