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Confidence Interval Solutions - Duke University

Confidence Interval Solutions 1. You want to rent an unfurnished one-bedroom apartment in Durham, NC next year. The mean monthly rent for a random sample of 60 apartments advertised on Craig s List (a website that lists apartments for rent) is $1000. Assume a population standard deviation of $200. Construct a 95% Confidence Interval . ($1000 *$200/sqrt(60), $1000 + *$200/sqrt(60)) ($ , $ ) We are 95% confident that the Interval ($ , $ ) covers the true mean monthly rent of Durham apartments listed on Craig s List. 2. To what population of apartments can you appropriately infer from your sample in #1?

confidence interval is probably not the appropriate tool to make inferences about the true mean mpg. 6. True or False: The population mean (μ) is a random variable that will fall within a confidence interval with 95% probability (with repeated sampling). FALSE. The population mean is NOT a random variable but a population parameter.

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