A senior accounting major at Midsouth State University has job offers from four CPA firms. To explore the offers further, she asked a sample of recent trainees how many months each worked for the firm before receiving a raise in salary. The sample information is submitted to Minitab with the following results:
Analysis of Variance
Source df SS MS F P
Factor 3 29.67 9.89 6.26 0.133
Error 16 25.29 1.58
Total 19 54.96
From the given Analysis of variance table.
P value is 0.133 > 0.05
We fail to reject H0.
Therefore, we can say that , the population means are all equal.
F critical value at 0.05 level of significance with numerator df=3 and denominator df=16 is 3.239
Decision rule : Reject H0 if F calculated value > 3.239
F critical value can be calculated by using Excel for F table
=FINV(0.05,3,16)....................................by using Excel command.
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