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you want to rent an unfirnished one bedroom flat in china , next year . the...

you want to rent an unfirnished one bedroom flat in china , next year . the mean monthly rent for a random sample of 50 flats advertised on a website is $500. assume a population standard deviation of 100

a) construct a 95% confidence interval

b) how large a sample of one bedroom flat above would be needed to estimate the population mean within plus or minus $20 with 95% confidence

Math   Statistics-And-Probability   
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a)

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