ANOVA A human factors psychologist studied three keyboard designs. Three samples of individuals were given material to t

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ANOVA
A human factors psychologist studied three keyboard
designs. Three samples of individuals were given material to type
on a particular keyboard. The number of errors each person
committed was recorded. The data is below:
T = 5 = A
SS = 12= A
T = 25 = B
SS = 20 = B
T = 30 = C
SS = 14 = C
N = 15
G = 60
ΣX2 = 356
Step 1: State the hypotheses. (Assume the alpha is
0.05).
​H0:
​H1:
Step 2: Locate the critical region. Begin by analyzing
the degrees of freedom.
dftotal:
dfbetween:
dfwithin:
Step 3: Perform the analyses. Begin with the analysis of
SS.
SStotal:
SSwithin:
SSbetween:
Calculate the MS values.
MSbetween:
MSwithin
Compute the F-Ratio:
F = ?
Step 4. Make a decision about the null and state your
conclusion.