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Suppose we know the standard deviation of a certain population is 8. A sample size of 64 has a mean of 85.
a) Determine the 95% confidence interval estimate of the population mean.
b) Repeat part (a) with a sample size of 100.
c) Repeat part (a) with a confidence interval of 99%.
d) Describe what happens to the confidence interval estimate when: - the sample size increases. - Confidence level increases
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