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

question 127

Short Answer

SCENARIO 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. $$\begin{array} { r l r l } \underline { \text { Day } } & \text { Range } & \underline { \text { Mean } } & \underline { \text { Std.Dev. } } \\1 & 10 & 5.250 & 3.4949 \\2 & 31 & 15.250 & 10.3060 \\3 & 13 & 20.375 & 4.9262 \\4 & 21 & 22.875 & 8.3911 \\5 & 35 & 8.500 & 11.3767 \\6 & 18 & 7.875 & 6.9372 \\7 & 25 & 11.250 & 8.5815 \\8 & 30 & 7.875 & 9.5235 \\9 & 17 & 10.250 & 6.3640 \\10 & 22 & 9.500 & 7.8740 \\11 & 27 & 7.875 & 8.7086 \\12 & 26 & 12.875 & 9.3723\end{array}$$
-Referring to Scenario 18-8, an R chart is to be constructed for the time required to register. The
center line of this R chart is located at __________.

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Definitions:

Intensity Threshold

The minimum level of stimulus intensity that is required to elicit a perceptible response in a sensory system.

Sound Frequency

A measure of the number of sound vibrations or cycles per second, typically expressed in Hertz (Hz), determining the pitch of the sound.

Male Cricket Calls

Sounds produced by male crickets, often by rubbing their wings together, to attract females or deter rivals.

Stimulus Filtering

The process by which organisms selectively ignore or pay attention to various environmental stimuli to reduce informational overload.