In a sample of 50 retirees aged 60-70 the average number of, Ask an Expert

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In a sample of 50 retirees aged 60-70, the average number of jobs they had during thier lifetime was 7.2. The population standard deviation is 2.1

Find the 99% confidence interval of the mean number of jobs?

To estimate the true mean within 1/2 job with 99% confidence, how large of a sample is needed?

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