Week 2 chapter exercises

Week 2 chapter exercises - Chapter 9 Exercises 1 Chapter 9...

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Chapter 9 Exercises 1 Chapter 9 Exercises Fadi Fayad RES/342 02/17/2011 G. Morris Hamm
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Chapter 9 Exercises 2 Chapter 9 Exercises (9.54)   Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages. (a) At the .01 level of significance, is the true mean greater than 10? (b) Use Excel to find the right-tail p-value. H0: mean=10 Ha: mean>10. we set alpha = 0.01. We calculate the test statistic to be: t=(14.44-10)/(4.45/sqrt(35)) = 5.903. We use excel to determine the p-value. The function =tdist (5.903, 34, 1) yields the p-value to be 5.75821E-07 (i.e., an exceedingly small number.) which is much lower than 0.01. So we can conclude that the true mean is greater than 10. People are cheating on the rule. They're faxing when
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Week 2 chapter exercises - Chapter 9 Exercises 1 Chapter 9...

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