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# 09_18_09 - STAT 409 Fall 2009 Examples for A(1 100...

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STAT 409 Examples for 09/18/2009 Fall 2009 A (1 - α ) 100% confidence interval for the population mean μ n z x σ 2 α ± n s t x 2 α ± n 1 degrees of freedom 1. A manufacturer of TV sets wants to find the average selling price of a particular model. A random sample of 25 different stores gives the mean selling price as \$342 with a standard deviation of \$14. Assume the prices are normally distributed. Construct a 95% confidence interval for the mean selling price of the TV model. 2. Measurements of the acidity (pH) of rain samples were recorded at 9 sites in an

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09_18_09 - STAT 409 Fall 2009 Examples for A(1 100...

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