Question

A sample of 1500 computer chips revealed that 27% of the chips do not fail in the first 1000 hours of their use. The company's promotional literature states that 25% of the chips do not fail in the first 1000 hours of their use. The quality control manager wants to test the claim that the actual percentage that do not fail is different from the stated percentage. Find the value of the test statistic. Round your answer to two decimal places.

Answer #1

Population proportion value is =0.25

x=405

n=1500

Estimate for sample proportion =0.27

Z test statistic formula for proportion

=1.79

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