The postal service sorts mail as Priority Mail Express, Priority Mail, First-Cla
ID: 3228800 • Letter: T
Question
The postal service sorts mail as Priority Mail Express, Priority Mail, First-Class Mail, or Standard Mail. Over a period of 3 weeks, 23 of each type were mailed from the Network Distribution Center in Altanta, Georgia, to Des Moines, Iowa. The total delivery time in days was recorded. Minitab was used to perform the ANOVA. The results follow:
What is the decision rule? Use the 0.01 significance level. (Round your answer to 2 decimal places.)
Reject H0 if F> ___
The postal service sorts mail as Priority Mail Express, Priority Mail, First-Class Mail, or Standard Mail. Over a period of 3 weeks, 23 of each type were mailed from the Network Distribution Center in Altanta, Georgia, to Des Moines, Iowa. The total delivery time in days was recorded. Minitab was used to perform the ANOVA. The results follow:
What is the decision rule? Use the 0.01 significance level. (Round your answer to 2 decimal places.)
Reject H0 if F> ___
Source DF SS MS Factor 12.81 4.27 319 028 88 Error 11791 1.34 91 130.72 Total s 1 R-sq 12%, R-Sq (adj) 7% N Mean StDev Level Priority Mail Express 23 1.448 1.015 Priority Mail 23 1.553 1.453 First-Class Mail 23 2.442 1.584 Standard Mail 23 2.399 .969Explanation / Answer
For significance level of 0.01, with 3 and 88 degrees of freedom
F-critical value from the table is 3.99
Since F-calulated value 3.19 is less than the critical value 3.99. Hence accept Ho or null hypothesis.
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