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

question 37

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, what is the standardized value of the estimate of the mean of the sampling distribution for the difference between sample means?

• A) 2.0115
• B) 0.3544
• C) 2.2140
• D) 0.2025

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Definitions:

Cost Classifications

The categorization of costs based on their characteristics, such as by behavior, purpose, or relevance to decision making.

Cost Data

Refers to the collection of financial information related to the production, operation, or management of a business that is used for budgeting, cost control, and decision-making purposes.

Value Chain

A sequence of activities that a company performs to design, produce, market, deliver, and support its products.

R&D

Research and Development, which refers to the activities companies undertake to innovate and introduce new products or services.