Instruction 18-4
a Manufacturer of Computer Disks Took Samples of 240

question 28

Short Answer

Instruction 18-4
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.
$$\begin{array} { r c c } \text { Day } & \text { Bad } & \% \text { Bad } \\\hline 1 & 9 & 0.037500 \\2 & 7 & 0.029167 \\3 & 4 & 0.016667 \\4 & 6 & 0.025000 \\5 & 8 & 0.033333 \\6 & 3 & 0.012500 \\7 & 6 & 0.025000 \\8 & 10 & 0.041667 \\9 & 16 & 0.066667 \\10 & 24 & 0.100000 \\11 & 15 & 0.062500 \\12 & 9 & 0.037500 \\13 & 4 & 0.016667 \\14 & 8 & 0.033333 \\15 & 6 & 0.025000\end{array}$$
-Referring to Instruction 18-4,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 ________.

---

Definitions:

Specific Number

A distinct or precisely identified quantity, often used in mathematical or statistical contexts.

Randomly Varying

Describes a process or phenomenon that changes unpredictably, without a discernible pattern or order.

Fixed-interval Schedule

A type of conditioning reinforcement schedule where rewards are provided after a specified time interval has passed.

Continuous Reinforcement

A method of learning where a behavior is reinforced each time it is exhibited, leading to faster acquisition of the behavior.