TABLE 10-14
a Problem with a Telephone Line That Prevents

question 19

Multiple Choice

TABLE 10-14
A problem with a telephone line that prevents a customer from receiving or making calls is disconcerting to both the customer and the telephone company. The data on samples of 20 problems reported to two different offices of a telephone company and the time to clear these problems (in minutes) from the customers' lines are collected. Below is the Excel output to see whether there is evidence of a difference in the mean waiting time between the two offices assuming that the population variances in the two offices are not equal.
$$\begin{array}{l}\text { t- Test: Two- Sample Assuming Unequal Variances }\\\begin{array} { l r r } \hline & \text { Office 1 } & \text { Office 2 } \\\hline \text { Mean } & 2214 & 2.0115 \\\text { Variance } & 2.951657 & 3.57855 \\\text { Observations } & 20 & 20 \\\text { Hypothesized Mean Difference } & 0 & \\\mathrm { df } & 38 & \\\mathrm { t } \text { Stat } & 0.354386 & \\\mathrm { P } ( \mathrm { T } < = \mathrm { t } ) \text { one- tail } & 0.362504 & \\\mathrm { t } \text { Critical one- tail } & 1.685953 & \\\mathrm { P } ( \mathrm { T } < = \mathrm { t } ) \text { two- tail } & 0.725009 & \\\mathrm { t } \text { Critical two- tail } & 2.024394 &\end{array}\end{array}$$
-Referring to Table 10-14, suppose ? = 0.05. Which of the following represents the result of the relevant hypothesis test?

• A) The null hypothesis is rejected.
• B) The null hypothesis is not rejected.
• C) The alternative hypothesis is rejected.
• D) Insufficient information exists on which to make a decision.

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Definitions:

Pattern

A repeated decorative design or a model used as a guide in manufacturing processes to replicate part shapes.

Drag

The resistance force encountered by an object moving through a fluid or by a fluid moving around an object.

Cope

To shape or modify the end of a beam or structural element to fit the contours of another, or to allow it to rest securely on a connection.

ASME

The American Society of Mechanical Engineers, an organization that sets standards and codes for engineering practices, including dimensions, tolerances, and technical specifications.