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# Rising FAX Costs

Chapter Exercises 9.54

Faced with rising FAX costs, a firm issued a guideline that transmissions of 10 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.

Claim: True mean greater than 10.
The level of significance of the test a =0.01

(a) State the null and alternative hypothesis symbolically.
Ho :
H1 :

(b) The value of the test statistic is found to be t=.5.90 At a=0.01, can it be concluded that the true mean is greater than 10 pages? Why or why not? Explain!

#### Solution Preview

Chapter Exercises 9.54

Faced with risinf FAX costs, a firm issued a guideline that transmissions of 10 or more should bw sent by 2-day mail instead. Wxceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax ...

#### Solution Summary

The solution examines rising FAX costs. The null and alternative hypothesis is determined.

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