TABLE 18-8 Recently, a University Switched to a New-Referring to Table 18-8, an R Chart Is to Be

The Answer of TABLE 18-8 Recently, a University Switched to a New-Referring to Table 18-8, an R Chart Is to Be

TABLE 18-8 Recently, a University Switched to a New-Referring to Table 18-8, an R Chart Is to Be

The Answer of TABLE 18-8 Recently, a University Switched to a New-Referring to Table 18-8, an R Chart Is to Be

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

question 55

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 R chart is to be constructed for the time required to register. One way to create the upper control limit involves multiplying the average of the sample ranges by D4. For this data set, the value of D4 is______ .

Definitions:

Repeat Purchases

Occurs when customers buy a product or service again, typically an indicator of customer satisfaction and loyalty.

Mobile Advertising

Marketing campaigns and advertisements specifically designed for delivery and viewing on mobile devices such as smartphones and tablets.

Flat-Screen Monitors

Displays with a thin profile and flat-panel design, using technologies like LCD or LED, for computers and televisions.

Forgetting Rate

The speed at which information is lost over time from an individual's memory, often considered in the context of learning and memory retention strategies.