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  3. find a 99% confidence interval for a mean of 220.

Find a 99% confidence interval for a mean of 220. Does the test stastic lie in...

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Statistics

Find a 99% confidence interval for a mean of 220. Does the teststastic lie in the confidence interval?

Standard Deviation: 74.

Answer & Explanation Solved by verified expert
4.3 Ratings (825 Votes)
the formula for the confidence interval is where sample mean 220 standard deviation74 standard normal variate at If the population standard deviation is unknown andwe need to    See Answer
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