A researcher records the number of words recalled by students presented with a l

Question

A researcher records the number of words recalled by students presented with a list of words for one minute. In one group, students were presented with the list of words in color; in a second group, the same words were presented black and white. An equal number of students were in each group. Based on the statement below, state the sample size in each group, the decision (to retain or reject the null hypothesis) and the effect size of this study.

Participants recalled significantly more words when the words were presented in color (M= 12.4 words) verses black and white (M=10.9 words) , t(48), p< 0.05 (d= 0.18).

Explanation / Answer

A researcher records the number of words recalled by students presented with a list of words for one minute. In one group, students were presented with the list of words in color; in a second group, the same words were presented black and white. An equal number of students were in each group. Based on the statement below, state the sample size in each group, the decision (to retain or reject the null hypothesis) and the effect size of this study.

Participants recalled significantly more words when the words were presented in color (M= 12.4 words) verses black and white (M=10.9 words) , t(48), p< 0.05 (d= 0.18).

n1+n2*2=48

n1+n2=50 for equal sample size,n=25

sample size 25 in each group

the decision : null hypothesis is rejected because P<0.05

effect size of this study =0.18

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