Question: Using a 95% confidence interval, estimate the mean difference in IQ between the oldest and the youngest siblings of a family based on the following

Using a 95% confidence interval, estimate the mean difference in IQ between the oldest and the youngest siblings of a family based on the following random sample of IQs. Assume a normal distribution.

Oldest	145	133	116	128	85	100	105	150	97	110	120	130
Youngest	131	119	103	93	108	100	111	130	135	113	108	125

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