Illustrate what is the minimum range

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Reference no: EM1355053

Confidence Intervals: z tests.

Digital Switches, Inc., produces a product called the C3PO with an advertised 0.5% failure rate. A test of products shipped from the factory to the company's testing lab found a sample average failure rate of 0.45% with a sample standard deviation of 0.15% when a sample of n = 64 observations was studied.

A. Calculate the range within which the population average failure rate can be found with 95% confidence.

B. Assuming that s = 0.15% cannot be reduced, and a sample size of n = 64, illustrate what is the minimum range within which the sample average failure rate must be found to justify with 95% confidence the advertised failure rate of 0.5%?

Reference no: EM1355053

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