The postal service groups first-class mail as letters

The postal service groups first-class mail as letters, cards, flats, or parcels. Over a period of three weeks, one item of each kind was sent from a particular postal administrative center. The total time in transit was recorded. A statistical software package was then used to perform the analysis. The results follow.

Source DF SS MS F P
Factor 3 13.81 4.60 2.60 .058 
Error 76 134.39 1.77 

Total 79 148.20 


S = 1 R-Sq = 10% R-Sq(adj) = 6%
S = 1 R-Sq = 10% R-Sq(adj) = 6%

Level N Mean StDev
Letters 20 1.492 1.017 
Cards 20 1.645 1.481 
Flats 20 2.499 1.647 
Parcels 20 2.443 .953 

Use the 0.01 significance level to test if this evidence suggests a difference in the means for the different types of first-class mail.

Requirement (1a):
Identify the null hypothesis and the alternate hypothesis.

Null hypothesis:

Alternate hypothesis:

What is the decision rule? Use the 0.01 significance level. (Hint: using Megastat function.) (Round your answer to 4 decimal places.)