A random sample of 14 chemical solutions is obtained, and
Chapter 8, Problem 8.1.25(choose chapter or problem)
A random sample of 14 chemical solutions is obtained, and their strengths are measured. The sample mean is 5437.2 and the sample standard deviation is 376.9. (a) Construct a two-sided 95% condence interval for the average strength. (b) Estimate how many additional chemical solutions need to be measured in order to obtain a two-sided 95% condence interval for the average strength with a length no larger than 300.
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