A Researcher Wishes to Determine Whether People with High Blood $\mu _ { 1 }$

Multiple Choice

A researcher wishes to determine whether people with high blood pressure can reduce their blood pressure by following a particular diet.Use the sample data below to construct a 99% confidence interval for $\mu _ { 1 }$ - $\mu 2$ ,where $\mu _ { 1 }$ and $\mu 2$ represent the population means for the treatment group and the control group,respectively. $\text { Treatment Group }$ $$\text { Control Group }$$ n1 = 85 n2 = 75 $\bar { x } _ { 1 }$ = 189.1 $\bar { x } _ { 2 }$ = 203.7 s1 = 38.7 s2 = 39.2

A) (-1.5,30.7)
B) (-1.3,30.5)
C) (-29.0,-0.2)
D) (-26.8,-2.4)
E) (-30.7,1.5)