Confidence interval for a mean based on sample size
The half width of a 99% confidence interval for a mean based on sample size of 30 is 10. What is the value of the sample standard deviation? Give your answer to 2 decimal places.
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The half width of a 95% confidence interval for a population mean based on a sample size of 30 is 5.9. What is the value of the standard error of the sample mean? Give your answer to two decimal places.
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