Please help me answer this question you want to save my life!!! :)
1 answer:
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Answer:
1.28
Step-by-step explanation:
Given that a sample of 1500 computer chips revealed that 55% of the chips do not fail in the first 1000 hours of their use. The company's promotional literature states that 53% of the chips do not fail in the first 1000 hours of their use.
(Two tailed test for testing sample proportion with population proportion)
Std error of proportion assuming p = 0.53 is
p difference = 0.02
Z= test statistic = p diff/std error = 1.2775~1.28