Question 195915
Concerned about Friday absenteeism, management examined absenteeism rates for the last three Fridays in four assembly plants. Does this sample prove that there is a significant difference in treatment means? Absences
Month	Plant 1	Plant 2	Plant 3	Plant 4
4-Mar	19	18	27	22
11-Mar	22	20	32	27
18-Mar	20	16	28	26
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Ho: The means are the same for the 4 Plants
H1: At least one of the means is different
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I ran an ANOVA Test on the 4 columns of data and got the following:
Test statistic: F = 14.18..
p-value = 0.00144
Conclusion:
Since the p-value is less than 5%, reject Ho.
At least one of the means is different.
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Cheers,
Stan H.