Question: 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

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 Atlanta, Georgia, to Des Moines, Iowa. The total delivery time in days was recorded. Minitab was used to perform the ANOVA. The results follow:

Source DF SS MS F P
Factor 3 2.05 0.68 2.13 0.104
Error 68 21.83 0.32
Total 71 23.88

Level N Mean StDev
Priority Mail Express 18 2.928 0.419
Priority Mail 18 3.066 0.821
First-Class Mail 18 3.383 0.586
Standard Mail 18 3.044 0.301

Using the ANOVA results, compare the average delivery times of the four different types of mail. Required: a. Identify the null hypothesis and the alternate hypothesis.

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

  1. H0: 1 2 3 4

  2. H0: 1 = 2 = 3 = 4

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