Construct and Interpret Confidence Intervals About the Population Mean Difference $95 \%$

Multiple Choice

Construct and Interpret Confidence Intervals about the Population Mean Difference of Matched -Pairs Data
-Nine students took the SAT. Their scores are listed below. Later on, they read a book on test preparation and retook the SAT. Their new scores are listed below. Construct a $95 \%$ confidence interval for $\mu _ { \mathrm { d } }$ . Assume that the distribution is normally distributed.

A) $( - 30.503 , - 0.617 )$
B) $( - 20.341,4.852 )$
C) $( - 10.321,15.436 )$
D) $( 1.651,30.590 )$