(Solution Download) The postal service groups first class mail as letters cards flats


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........ 13.82......... 4.61......... 2.72..... 0.051
Error................ 68....... 115.17......... 1.69
Total................. 71....... 128.99
S = 1.301......... R-Sq = 10.71%............... R-Sq(adj) = 6.77%
Individual 95% CIs for Mean Based on Pooled StDev

Use the .05 significance level to test if this evidence suggests a difference in the means for the different types of first-class mail.

 







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