Question

Effect Size and Post-Hoc Tests

For each of the following studies, use the information given to calculate the effect size and then do post-hoc tests and interpret the results. Use alpha = .05

1. Fifteen third-grade students participated in a memory experiment. Five students had a story read to them by a teacher, five read the story themselves, and five saw a video of the story. Each student then took a memory test on 12 items from the story. The children who heard their teacher read the story recalled an average of 5 items. Those who read the story had an average recall of 9 items, and those who saw the video tape recalled an average of 10 items.

source	SS	df	MS	F
between	48	2	24	4
within	72	12	6
total	120	14

2. You think that people work faster in the cold. To investigate this you have people do a word search task in one of four rooms. You record how many minutes it takes to complete the task. The room temperatures are set at 50, 60, 70, and 80 degrees. The average time it takes to complete the task for the 50 degree room is 6 minutes, for the 60 degree room is 2.3 minutes, for the 70 degree room is 3.7 minutes, and for the 80 room is 6.7 minutes. There were three people in each group.

source	SS	df	MS	F
between	36	3	12	6
within	18	9	2
total	54	12

Answer 1

1)

effect size =0.4

Level of significance	0.05
no. of treatments,k	3
DF error =N-k=	12
MSE	6.000
q-statistic value(α,k,N-k)	3.7700

			confidence interval
population mean difference	critical value	lower limit	upper limit	result
µ1-µ2	-4.00	4.13	-8.13	0.13	means are not different
µ1-µ3	-5.00	4.13	-9.13	-0.87	means are different
µ2-µ3	-1.00	4.13	-5.13	3.13	means are not different

..............

2)

i think there is something wrong with table

df of within should be 8 and total df shold be 11

please clearify

....................

THANKS

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