SCENARIO 18-5
a Manufacturer of Computer Disks Took Samples of 240

question 133

Short Answer

SCENARIO 18-5
A manufacturer of computer disks took samples of 240 disks on 15 consecutive days. The number of
disks with bad sectors was determined for each of these samples. The results are in the table that
follows. $\begin{array}{ccc} \underline{\text { Day }}& \underline{\text { Bad }} & \underline{ \% \mathrm{Bad}}\\1 & 9 & 0.037500 \\2 & 7 & 0.029167 \\3 & 4 & 0.016667 \\4 & 6 & 0.025000 \\5 & 8 & 0.033333 \\6 & 3 & 0.012500 \\7 & 6 & 0.025000 \\8 & 10 & 0.041667 \\9 & 16 & 0.06667 \\10 & 24 & 0.100000 \\11 & 15 & 0.062500 \\12 & 9 & 0.037500 \\13 & 4 & 0.016667 \\14 & 8 & 0.033333 \\15 & 6 & 0.025000\end{array}$

-Referring to Scenario 18-5, a p control chart is to be made for these data. The estimate of the
standard error of the proportion of disks with bad sectors is __________.

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Definitions:

Weighted Average

A calculation that takes into account the varying degrees of importance of the numbers in a dataset, often used in inventory valuation and grading.

Lower-Of-Cost-Or-Market

An accounting principle that values inventory at the lower of its historical cost or market value, to comply with the conservatism principle.

Inventory Valuation

The method of assigning a monetary value to items in inventory, critical for cost of goods sold calculation and financial reporting.

Balance Sheet

A financial statement that summarizes a company’s assets, liabilities, and shareholders' equity at a specific point in time, providing a snapshot of its financial condition.