Two Types of Flares Are Tested for Their Burning Times $\text { Brand } \mathrm { X }$

Multiple Choice

Two types of flares are tested for their burning times (in minutes) and sample results are given below. $\text { Brand } \mathrm { X }$ $\text { Brand } \mathrm { Y }$ n = 35 n = 40 $\overline{x}$ = 19.4 $\overline{x}$ = 15.1 s = 1.4 s = 0.8
Construct a 95% confidence interval for the difference $$\mu \mathrm { X }$$ - $\mu Y$ based on the sample data.

A) (3.5,5.1)
B) (3.8,4.8)
C) (3.6,5.0)
D) (-4.7,-3.9)
E) (3.2,5.4)