h 12 and 15) Exercise 12-37 (LO12-2, LO12-3) The postal service sorts mail as Pr

Question

h 12 and 15) Exercise 12-37 (LO12-2, LO12-3) The postal service sorts mail as Priority Mail Express, Priority Mail, First-Class Mail, or Standard Mail. Over a period of 3 weeks, 18 of each type were mailed from the Network Distribution Center in Atianta, Georgia, to Des Moines, lowa. The total delivery time in days was recorded. Minitab was used to perform the ANOVA The results follow 2.67 0.89 3.07 0.034 15.43 0.29 22.10 Erro Priority Mail Express Priority Mail First-CIass Mal Standard Mai 18 2.928.622 18 3.252 0.583 18 3.193 .473 Using the ANOVA results, compare the average delivery times of the four different types of mail 1 Identify the null hypothesis and the alternate hypothesis Null hypothesis: Prev 5 or 12 Next > MacBook Air 3 5 6 8 9

Explanation / Answer

1) null hypothesis is H0 : means are equal. (option b)

In ANOVA we tke null hypothesis as the means are equal.

2) alternative hypothesis: At least one mean is different.

3) reject H0 if F > 0.0125

4) P value is 0.034

alpha 0.01

here, P value > alpha.

So we accept the null hypothesis.

there is no significant dofference between the means.

alpha = 0.01

this is a two tailed test as alternative hypothesis is at least one of the mean is not equal to others.

so Z value= 0.01253

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