Two types of flares are tested and their burning times are recorded. The summary statistics are given below: n=35 n=40 =19.4min =15.1min s=1.4min s=0.8min Construct a95%confidence interval for the differences between the mean burning time of the brand X flare and the mean burning time of the brand Y flare.

Assume that the two samples are independent simple random samples selected from normally distributed populations with unequal variances.

Group of answer choices

3.2 min < _X- _Y< 5.4 min

3.6 min < _X- _Y< 5.0 min

3.8 min < _X- _Y< 4.8 min

3.5 min < _X- _Y< 5.1 min