The postal service sorts mail as Priority Mail Express, Priority Mail, First-Cla

Question

The postal service sorts mail as Priority Mail Express, Priority Mail, First-Class Mail, or Standard Mail. Over a period of 3 weeks, 19 of each type were mailed from the Network Distribution Center in Altanta, Georgia, to Des Moines, Iowa. The total delivery time in days was recorded. Minitab was used to perform the ANOVA. The results follow:

Using the ANOVA results, compare the average delivery times of the four different types of mail.

What is the decision rule? Use the 0.05 significance level. (Round your answer to 2 decimal places.)

rev: 11_13_2015_QC_CS-29041

The postal service sorts mail as Priority Mail Express, Priority Mail, First-Class Mail, or Standard Mail. Over a period of 3 weeks, 19 of each type were mailed from the Network Distribution Center in Altanta, Georgia, to Des Moines, Iowa. The total delivery time in days was recorded. Minitab was used to perform the ANOVA. The results follow:

Explanation / Answer

The p value is less than alpha=0.05. One of th emean delivery tim eis significantly different from another mean delivery time.

Decision rule is:Reject H0, if F>2.73 (F critical at dfb=3, ad dfw=72)

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