Perform a hypothesis test to assess whether there are significant differences in mean BMD for the femoral neck between the heavier- and lighter-smoking twins?

Table 7.10 Itching scores reported by participants

 

^aItching score left eye €“ itching score right eye.

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Eye Difforence Subject L. -1 3 4 3 -2 4 3 -1 4 -2 3 4 10 1 2 -1 Mean 2.60 2.80 -0.20 sd 1.17 1.03 1.55 10 10 10