review-sample-mean-1

# review-sample-mean-1 - STOR 155 Review questions for...

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STOR 155 Review questions for Statistical inference for sample mean

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Question 1 Determine whether each of the following statements is true or false. A) The margin of error for a 95% confidence interval for the mean μ increases as the sample size increases. B) The margin of error for a confidence interval for the mean μ, based on a specified sample size n, increases as the confidence level decreases. C)The margin of error for a 95% confidence interval for the mean μ decreases as the population standard deviation decreases. D)The sample size required to obtain a confidence interval of specified margin of error m increases as the confidence level increases. Answer: A) False, B) False, C) True, D) True
Question 2 A) 90% B) 95% C) 99% D) 99.9% Answer: C

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Chocolate bars produced by a certain machine are labeled 8.0 oz. The distribution of the actual weights of these chocolate bars is claimed to be Normal with a mean of 8.1 oz and a standard deviation of 0.1 oz. A quality control manager initially plans to take a simple random sample of size n from the production line. If he were to double his sample size (to 2n), by what factor would the standard deviation of the sampling distribution of the sample mean change? A)
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review-sample-mean-1 - STOR 155 Review questions for...

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