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

question 81

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, which of the following represents the relevant hypotheses tested by the telephone company?

• A) \( H_{0}: \mu_{I}-\mu_{I I} \leq 0 \) versus \( H_{1}: \mu_{I}-\mu_{I I}>0 \)
• B) \( H_{0}: \mu_{I}-\mu_{I I} \neq 0 \) versus \( H_{1}: \mu_{I}-\mu_{I I}=0 \)
• C) \( H_{0}: \mu_{I}-\mu_{I I}=0 \) versus \( H_{1}: \mu_{I}-\mu_{I I} \neq 0 \)
• D) \( H_{0}: \mu_{I}-\mu_{I I} \geq 0 \) versus \( H_{1}: \mu_{I}-\mu_{I I}<0 \)

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Definitions:

Feedback

Information provided regarding aspects of one's performance or understanding, aimed at improvement.

Selective Perception

The process by which individuals perceive what they want to in media messages while ignoring opposing viewpoints.

Filtering

The process of screening or removing certain information or stimuli, often to focus on more relevant or significant data.

Dichotic Listening

A psychological test where an individual receives different auditory stimuli in each ear simultaneously and is asked to focus on one to measure selective attention.