TABLE 17-5 A Manufacturer of Computer Disks Took Samples of 240 Disks

question 8

Short Answer

TABLE 17-5
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.
-Referring to Table 17-5, 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:

Level Of Significance

The probability of rejecting the null hypothesis in a statistical test when it is actually true, used as a criterion for judging whether an observed effect is statistically significant.

Upper-tail Area

The area under the probability density function of a continuous random variable to the right of a specified value, used in significance testing.

Pooled Proportion Estimate

A method used to estimate the combined proportion from two or more groups, assuming that the underlying proportions across groups are the same.

Null Hypothesis

A statistical hypothesis that assumes no significant difference or effect exists among the variables studied.