Hypothesis testing for one sample mean.
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more must be sent by 2day mail instead. Exceptions are allowed, other than they want the average to be 10 or below. The firm examined 35 arbitrarily chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages.
(a) At.01 level of significance, is the true mean greater than 10?
(b) Use Excel to find the righttail pvalue.
Hypotheses

H0: _ = 10 vs. _ > 10

Level of Significance:

0.01

Decision Rule

Reject the null hypothesis if pvalue < 0.01

Calculation:

Hypothesis Test: Mean vs. Hypothesized Value

Hypothesized value

10.000

Mean Sample

14.400

Std. dev.

0.752

n

35

5.85

Z

2.46E

Pvalue
