It is known that the variance of a population equals 1296 . A random sample of 144 observations is going to be taken from the population
a. With a .95 probability, what statement can be made about the size of the margin of error?
b. With a .95 probability, how large of a sample would have to be taken to provide a margin of error of 6 or less?
a. There is a .95 probability that the sample mean will provide a margin of error of 5.88 or less.
b. 139
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