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______ .

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Definitions:

Extraordinary Gain

A gain that arises from events or transactions that are distinct and infrequent in nature, not expected to recur regularly.

Provision For Inventories

An accounting practice where a reserve is made for potential decreases in the value of a company’s inventory.

Inventories Losses

Reductions in the amount or value of inventories due to factors such as deterioration, obsolescence, or theft, resulting in financial loss.

Lower Of Cost

An accounting principle requiring that the inventory is recorded at the lower of its cost or the current market value.