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2. A random sample of 225 measurements is selected from a population, and
the sample mean and standard deviation are x=32.5 and s = 30.0,
a. Use a 99% confidence interval to estimate the mean of the population,
H .
b. How large a sample would be needed to estimate u to within .5
with 99% confidence?
c. What is meant by the phrases "99% confidence" as it is mused in this

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