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A researcher is interested in determining if there is a difference in IQ's between older and younger siblings. The researcher selected 22 pairs of siblings

A researcher is interested in determining if there is a difference in IQ's between older and younger siblings. The researcher selected 22 pairs of siblings and it was found that the average difference in IQs (older - younger) was 3.2 points with a standard deviation of 9.2 points. Construct and interpret a 90% confidence interval for the mean difference.

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