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, 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:
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.

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 0.05
significance level. (Round your answer to 2 decimal
places.)
c. Use the 0.05 significance level to test if
this evidence suggests a difference in the means for the different
types of mail.