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A random sample of 24 chemical solutions is obtained, and their strengths are measured. The sample...

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Statistics

A random sample of 24 chemical solutions is obtained, and theirstrengths are measured. The sample mean is 5437.2 and the samplestandard deviation is 376.9.

(a) Construct a two-sided 98% confidence interval for theaverage strength.

(b) Estimate how many additional chemical solutions need to bemeasured in order to obtain a twosided 98% confidence interval forthe average strength within a margin of error that is 150

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Solution Given thatPoint estimate sample mean 54372sample standard deviation s    See Answer
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