By how much does the standard error of x-bar change if the, Ask an Expert

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Assume that a random variable, x, is distributed according to a normal distribution with mean 46 and standard deviation 12.

a) What is the standard error of the estimate, x-bar, if a sample of size 25 is taken?

b) By how much does the standard error of x-bar change if the sample is increased to 100?

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