Construct the Confidence Interval for the Difference $\mu _ { 1 } - \mu _ { 2 }$

Multiple Choice

Construct the confidence interval for the difference $\mu _ { 1 } - \mu _ { 2 }$ for the given level and values of $\bar { x } _ { 1 } , \bar { x } _ { 2 }$ , $s _ { 1 } , s _ { 2 } , n _ { 1 }$ , and $n _ { 2 }$ .
Level $90 \% , \bar { x } _ { 1 } = 91.6 , \bar { x } _ { 2 } = 79.2 , s _ { 1 } = 7.1 , s _ { 2 } = 7.3 , n _ { 1 } = 15$ , and $n _ { 2 } = 11$

A) (9.0, 15.8)
B) (10.3, 14.5)
C) (7.2, 17.6)
D) (10.8, 14.0)