In the following situation we want to compare the mean responses in several popu

Question

In the following situation we want to compare the mean responses in several populations.

Are you a morning person, an evening person, or neither? Does this personality trait affect how well you perform? A sample of 104 students took a psychological test that found 20 morning people, 32 evening people, and 52 who were neither. All the students then took a test of their ability to memorize at 8 a.m. and again at 9 p.m. You analyze the score at 8 a.m. minus the score at 9 p.m.

Give k, the ni, and N.

Give the degrees of freedom of the ANOVA F test.

Explanation / Answer

1)

k = 3

n1 =20

n2 = 32

n3 = 52

N = 20 + 32+52 = 104

2)

The degrees of freedom of the ANOVA F test.

Numerator df = k - 1 = 3 - 1 = 2

Dinominator df = N-k = 104-3= 101

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