TABLE 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}{l}
\text { Day }&\text {Bad }&\text {\% Bad }\
\hline1 & 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 Table 18-5, the process seems to be in control.

Question

TABLE 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}{l}
\text { Day }&\text {Bad }&\text {\% Bad }\
\hline1 & 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 Table 18-5, the process seems to be in control.

Quizplus · Accepted Answer

The process is not in control because there is a significant increase in the percentage of bad disks on days 9, 10, and 11, indicating potential issues.

TABLE 18-5 a Manufacturer of Computer Disks Took

TABLE 18-5
a Manufacturer of Computer Disks Took