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Unformatted text preview: Will a 90% confidence interval be narrower or wider than the 95% confidence interval? Calculate it: What is the margin of error for the 90% confidence interval? What about the 95% interval? If I collected another random sample of 50 Ames homes from this population what might change about the 95% interval? What would remain the same? If the population distribution is not Normal , can I still use these confidence interval formulas? Why? Calculate a 95% confidence interval for the mean square footage of all Ames homes ( : What is meant by the phrase “95% confident” in the interpretation of the above interval? Why is this interval narrower than the 95% confidence interval for the mean selling price? If I wanted the width of the 95% confidence interval for the mean square footage to be 100, how many homes would I need to include in the sample?...
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 Fall '08
 ABBEY
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