It is known that the variance of a population equals 484. A random sample of 81 observations is going to be taken from the population.
a.With a .80 probability, what statement can be made about the size of the margin of error?
b.With a .80 probability, how large of a sample would have to be taken to provide a margin of error of 3 or less?

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The Answer of It is known that the variance of a population equals 484. A random sample of 81 observations is going to be taken from the population.
a.With a .80 probability, what statement can be made about the size of the margin of error?
b.With a .80 probability, how large of a sample would have to be taken to provide a margin of error of 3 or less?

It Is Known That the Variance of a Population Equals