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# [Solved] Assignment 219969

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Subject: Mathematics    / Statistics
QuestionA) Consider a population with known variance ?2 = 4. In a simple random sample of sizen = 15 we find ¯x = 3.(a) Construct a 95% confidence interval for the population mean µ(b) Construct a 90% confidence interval for the population mean µ.(c) Construct a 99% confidence interval for the population mean µ(d) Would an 85% confidence interval be wider or narrower than the 90% confidence interval?Answer this question without doing any calculations.B) We take a simple random sample of size 50 from a population with unknown variance. We find the sample mean is ¯x = 25 and the sample standard deviation is s = 15.(a) Give the 90% confidence interval for the population mean µ.(b) Give the 95% confidence interval for the population mean µ.(c) Give the 99% confidence interval for the population mean µ

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[Solved] Assignment 219969
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