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MNO2502-25-S2
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For a proportion estimate, if the acceptable error is e = 0.07, π = 0.15, and Zα/2 = 1.96, the required sample size is approximately:
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If the population standard deviation (σ) is known, the formula for a 95% confidence interval for the mean is:
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In a sample of 500 study guides, 400 had no defects. What is the 95% confidence interval for the population proportion?
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A quality controller tests 50 lightbulbs and finds the sample mean lifetime is 100 hours. The population standard deviation is known as 25 hours. Compute the 95% confidence interval for the mean lifetime.
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A random sample of 8 lightbulbs shows a mean of 43.75 hours with sample standard deviation S = 15.05. Using 95% confidence, determine the confidence interval for the population mean.
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The formula for required sample size when estimating a mean is:
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Which factor will make a confidence interval narrower?
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An operations manager wants to estimate the mean fill of 2-litre bottles with a sampling error of ±5 ml at 95% confidence. The population standard deviation is 25 ml. What sample size is required?
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Which of the following best describes a confidence interval estimate?
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When the population standard deviation is unknown, which distribution is used for the confidence interval?
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