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Statistics for Engineers and Scientists | 4th Edition | ISBN: 9780073401331 | Authors: William Navidi
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A random sample of 400 electronic components manufactured

Chapter 5, Problem 9E

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QUESTION:

A random sample of 400 electronic components manufactured by a certain process are tested, and 30 are found to be defective.

a. Let p represent the proportion of components manufactured by this process that are defective. Find a 95% confidence interval for p.

b. How many components must be sampled so that the 95% confidence interval will specify the proportion defective to within ±0.02?

c. (Hard) The company ships the components in lots of 200. Lots containing more than 20 defective components may be returned. Find a 95% confidence interval for the proportion of lots that will be returned.

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QUESTION:

A random sample of 400 electronic components manufactured by a certain process are tested, and 30 are found to be defective.

a. Let p represent the proportion of components manufactured by this process that are defective. Find a 95% confidence interval for p.

b. How many components must be sampled so that the 95% confidence interval will specify the proportion defective to within ±0.02?

c. (Hard) The company ships the components in lots of 200. Lots containing more than 20 defective components may be returned. Find a 95% confidence interval for the proportion of lots that will be returned.

ANSWER:

Answer:

Step 1 of 5:

          Given data states that a random sample of 400 electronic components manufactured by a certain process are tested, and 30 are found to be defective.

 

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