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1. According to a random sample of 45 life insurance policy holders, the average annual premium paid on their policies was $340, with a standard

1. According to a random sample of 45 life insurance policy holders, the average annual premium paid on their policies was $340, with a standard deviation of $62. Find the 95% confidence interval for the population mean.

2. A statistics student surveys the monthly rent for 32 unfurnished one-bedroom apartments in Boston for a class project and discovers that the mean monthly rent is $1400, with a standard deviation of $220. Find the 95% confidence interval for the population mean.

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