The postal service sorts mail as Priority Mail Express, Priority Mail, First-Class Mail, or Standard Mail. Over a period

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The postal service sorts mail as Priority Mail Express, PriorityMail, First-Class Mail, or Standard Mail. Over a period of 3 weeks,18 of each type were mailed from the Network Distribution Center inAtlanta, Georgia, to Des Moines, Iowa. The total delivery time indays was recorded. Minitab was used to perform the ANOVA. Theresults follow:
Using the ANOVA results, compare the average delivery times of thefour different types of mail.Required:a. Identify the null hypothesis and thealternate hypothesis.Null hypothesis:
H0: μ1 ≠ μ2 ≠ μ3 ≠ μ4
H0: μ1 = μ2 = μ3 = μ4
multiple choice 1
a
b
Alternate hypothesis:
multiple choice 2
H1: At least one mean is different.
H1: All means are equal.
b. What is the decision rule? Use the 0.05significance level. (Round your answer to 2 decimalplaces.)
c. Use the 0.05 significance level to test ifthis evidence suggests a difference in the means for the differenttypes of mail.