SEx-bar = sqrt(MSe/ng)
ng is the number per group
(mean1 – mean2) / SEx-bar
(THIS WAS THE PREVIOS QUESTION)
Average GPA: Iowa = 2.10, California = 2.80, Arizona = 3.35
SSb = 4.20 SSe= 49.25
Set your alpha level at .05. Then…
df between = K – 1
df within = N – K
MSB= SSb/K-1
MSE = SSe/N-K
F(2, 72) = MSb/MSe
Given N = 75, k = 3 and alpha = 0.05
a) dfbetween = K-1 = 3-1 = 2
dfwithin = N - k = 75-3 = 72
b) MSB = SSb/k-1 = 4.20 / 2 = 2.1
MSE = SSe/N-k = 49.25 / 72 = 0.684
c) F-Ratio = MSB / MSE = 2.1 / 0.684 = 3.0702
d) F critical value = 3.124 at 5% df and (2,72) df
since F-Ratio is less than F-Critical value so we accept
H0
i.e. there is no statistically significant
e) Thus we conclude that there is no significant difference among the means of three groups
ANOVA Table:
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