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Interval estimate for the population mean

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1. A family is relocating from St. Louis, Missouri, to California. Due to an increasing inventory of houses in St. Louis, it is taking longer than before to sell a house. The wife is concerned and wants to know when it is optimal to put their house on the market. Her realtor friend informs them that the last 28 houses that sold in their neighborhood took an average time of 205 days to sell. The realtor also tells them that based on her prior experience, the population standard deviation is 68 days.

a. What assumption regarding the population is necessary for making an interval estimate for the population mean?

1a. Assume that the central limit theorem applies or 2a. Assume that the population has a normal distribution

b. Construct the 95% confidence interval for the mean sale time for all homes in the neighborhood. (Round intermediate calculations to 4 decimal places. Round z value to 3 decimal places and final answer to 2 decimal places.

Reference no: EM131402624

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