A stratified simple random sample has been taken with the following results. 
a.Determine a point estimate for the mean of the population.
b.Estimate the standard error of the mean.
c.Approximate a 95% confidence interval for the population mean.
d.Compute the population total.
e.Determine a 95% confidence interval for the population total.
Correct Answer:
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b.0.133
c.23...
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