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Unformatted text preview: Feb 812, 2010 Review: We have two objectives in this tutorial. You will use Normal/t distribution commands learned from last weeks tutorial. Confidence Interval Estimate: A sample mean  x is always used as a point estimate of a population mean . However, as the population is not exactly same as the sample, error always exists when we use  x to forecast . Therefore, we introduce a confidence interval estimate of the population mean. In other words, I would rather say is between 0.5 and 0.7 than is equal to 0.6. How to calculate the confidence interval estimator of a population mean ? There are two cases: Case 1: If the population standard deviation is known, use a normal distribution: Case 2: If the population standard deviation is unknown, use the sample standard deviation and a tdistribution: Hypothesis Testing for a Population Mean if the Population Standard Deviation is Known: Step 1: Whats your H and H 1 ?...
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This note was uploaded on 05/17/2011 for the course ECO 220 taught by Professor Tanaka during the Spring '11 term at University of Toronto Toronto.
 Spring '11
 tanaka

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