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There have been several studies conducted in an attempt to

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 98% confident that the mean IQ of the sample group is within three IQ points of the mean IQ of all left-handed adults? Assume that s is known to be 16.

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