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Using excel/XL Stat!!!!!! There have been several studies conducted in an attempt to identify ways in...

Using excel/XL Stat!!!!!!

There have been several studies conducted in an attempt to identify ways in which left handed people are different from those who are right handed. Assume that you want to estimate the mean IQ of all left-handed adults. How many random left-handed adults must be tested in order to be 99% confident that the mean IQ of the sample group is within four IQ points of the mean IQ of all left-handed adults? Assume that the standard devaistion is known to be 15.
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