1. With 20 subjects in a group and three groups, what F-ratio defines the 0.05 a
ID: 3132437 • Letter: 1
Question
1. With 20 subjects in a group and three groups, what F-ratio defines the 0.05 alpha level?
2.With 20 subjects in a group and three groups, what F-ratio defines the 0.01 alpha level?
3. Explain what is meant by
Omnibus test
Family-wise error rate
Post-hoc test
4.Name and state the defining characteristics of each of three analysis of variance procedures presented in this class, include when you would use each.
5.A oneway analysis of variance shows, F (3, 27) = 3.49. What is the p-value? Does this indicate a significant or nonsignificant difference among the groups?
6.A repeated measures analysis of variance shows, F (4, 20) = 14.56. How many repeated measures were there? How many subjects?
7.A 2x4 Factorial analysis of variance will produce how many F-ratios? List them by main effects and interaction effects.
8.Using the data below calculate the oneway analysis of variance. Report the F-ratio in APA style, including the p-value.
9.If there is a significant difference among the groups, what is the size of the treatment effect? If there is no significance difference, state no difference.
10.Put the means and standard deviations in an APA table and make and APA graph using Excel.
11.What is your conclusion from these findings?
Behavior Therapy: 58, 65, 71, 59, 63, 81, 74, 83
Drug Therapy: 59, 48, 32, 44, 38, 41, 30, 51
Play Therapy: 59, 61, 50, 60, 64, 62, 55, 58
Explanation / Answer
1) WE HAVE GROUP OF 3 WITH EACH HAVING 20
THE F TEST DESCRIBE THE RATIO OF TWO ESTIMATE OF VARIANCE ONE THAT IS TRUE AND OTHER THAT WILL BE TRUE IS THE NULL HYPOTHESIS WILL BE TRUE.
NOW THE ALPHA IS THE LEVEL AT WHICH WE ARE ACCEPTING THE LEVEL AT WHICH TYPE 1 ERROR CAN BE MADE
NOW THE DEGREE OF FREEDOM FOR THE GROUP = 3-1 = 2
AND THE DEGREE OF FREEDOM WITHIN THE GROUP = 60-3 = 57
SEEING THE VALUE IN THE F TABLE FOR 57 DEGREE OF FREEDOM WE WILL GET THE VALUE = 3.16
HENCE THE ANSWER = 3.16
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