23. A researcher records the number of words recalled by students presented with

Question

23. A researcher records the number of words recalled by students presented with a list of words for 1 minute. In one group, students were presented with the list of words in color; in a second group, the same words were pre- sented in black and white. An equal number of students were in each group. Based on the statement below, state the sample size in each Participants recalled significantly more words when the words were presented in color (M= 12.4 words) versus black and white (M= 10.9 words), t(48) = 2.009, p

Explanation / Answer

The difference in means of words recalled in color group vs b&w group is done via t-test difference of means and the results are given in the statement.

It has a t-stat, p-value and the differences it has been tested for.

t(48) means the degrees of freedom is 48.

The degrees of freedom for a difference in means test is (n1-1)+(n2-1).

since n1 and n2 are equal (called as n)

n-1+n-1 = 48

2n -2 =48

n = 25

The sample size in each group is 25.

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