A Test of Abstract Reasoning Is Given to a Random $\overline { \mathrm { d } }$

Multiple Choice

A test of abstract reasoning is given to a random sample of students before and after they completed a formal logic course.The results are given below.Construct a 95% confidence interval for the mean difference between the before and after scores if $\overline { \mathrm { d } }$ (before - after) = 3.7 and sd = 4.945 $$\text { Before } \begin{array} { l l l l l l l l l } 74 & 83 & 75 & 88 & 84 & 63&93 & 84 & 91 & 77\end{array}$$ After 73 77 70 77 74 67 95 83 84 75

A) (1.2,5.7)
B) (0.2,7.2)
C) (0.8,6.6)
D) (1.0,6.4)
E) (-4.4,11.8)