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The purpose of this exercise is to compare the variability of xbar 1 and xbar 2 with the variability of (xbar 1 -xbar 2 ).

The purpose of this exercise is to compare the variability of xbar1 and xbar2 with the variability of (xbar1-xbar2).

a.Suppose the first sample is selected from a population with mean 1=150 and variance 21=900. Within what range should the sample mean vary about 95% of the time in repeated samples of 100 measurements from this distribution?

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