TABLE 18-8
Recently, a University Switched to a New Type

question 7

Short Answer

TABLE 18-8
Recently, a university switched to a new type of computer-based registration. The registrar is concerned with the amount of time students are spending on the computer registering under the new system. She decides to randomly select 8 students on each of the 12 days of the registration and determine the time each spends on the computer registering. The range, mean, and standard deviation of the times required to register are in the table that follows.
$$\begin{array} { c c l l } \text { Day } & \text { Range } & \text { Mean } & \text { Std.Dev. } \\1 & 10 & 5.250 & 3.4949 \\2 & 31 & 15.250 & 10.3060 \\3 & 13 & 20.375 & 4.9262 \\4 & 21 & 22.875 & 8.3911 \\5 & 35 & 8.500 & 11.3767 \\6 & 18 & 7.875 & 6.9372 \\7 & 25 & 11.250 & 8.5815 \\8 & 30 & 7.875 & 9.5235 \\9 & 17 & 10.250 & 6.3640 \\10 & 22 & 9.500 & 7.8740 \\11 & 27 & 7.875 & 8.7086 \\12 & 26 & 12.875 & 9.3723\end{array}$$
-Referring to Table 18-8, an $\bar{X}$ chart is to be used for the time required to register. The center line of this chart is located at ______.

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Definitions:

Lieutenant Governor

A state government official in the United States who is second in command to the governor and may act as governor in their absence or if the governor's position becomes vacant.

Campaign Speech

A speech given by a candidate during an electoral campaign to promote their candidacy, communicate their platform, and persuade voters.

Margin Of Error

A statistic expressing the amount of random sampling error in a survey's results, indicating the preciseness of the estimates.

True Value

The actual, factual value or correctness of something, often used in the context of measurement, logic, or philosophy.