The Table Below Shows the Weights of 9 Subjects,in Kg,before

Multiple Choice

The table below shows the weights of 9 subjects,in kg,before and after they followed a particular diet for two months. $$\begin{array} { c | r r r r r r r r r } \text { Subject } & \text { A } & \text { B } & \text { C } & \text { D } & \text { E } & \text { F } & \text { G } & \text { H } & \text { I } \\\hline \text { Before } & 75.6 & 81.0 & 70.7 & 59.4 & 90.9 & 55.8 & 85.5 & 94.5 & 77.0 \\\hline \text { After } & 72.9 & 80.1 & 65.3 & 56.3 & 77.0 & 56.7 & 81.0 & 87.8 & 73.4\end{array}$$ Construct a 95% confidence interval for the mean difference of the "before" minus "after" weights if $\overline { \mathrm { d } }$ (before - after) = 4.4333 and sd = 4.2146

A) (2.8,7.0)
B) (-7.0,6.8)
C) (2.4,7.4)
D) (1.2,7.7)
E) (1.5,6.7)