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# Feb_7 - Feb 8-12 2010 Review We have two objectives in this...

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Feb 8-12, 2010 Review: We have two objectives in this tutorial. You will use Normal/t distribution commands learned from last week’s tutorial. Confidence Interval Estimate: A sample mean - x is always used as a point estimate of a population mean μ . However, as the population is not exactly same as the sample, error always exists when we use - x to forecast μ . Therefore, we introduce a confidence interval estimate of the population mean. In other words, I would rather say “ μ is between 0.5 and 0.7” than “ μ is equal to 0.6”. How to calculate the confidence interval estimator of a population mean μ ? There are two cases: Case 1: If the population standard deviation σ is known, use a normal distribution: Case 2: If the population standard deviation is unknown, use the sample standard deviation and a t -distribution: Hypothesis Testing for a Population Mean if the Population Standard Deviation is Known: Step 1: What’s your H 0 and H 1 ?

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Feb_7 - Feb 8-12 2010 Review We have two objectives in this...

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