We have measurements of the lifetimes (in minutes) of 6 sets of generic and 9 sets of brand-name AA batteries from a randomized experiment. Construct a confidence interval to test claim that the mean lifetime of generic batteries is greater than the mean lifetime of brand-name batteries. Use 90% confidence interval. (Do not forget to draw a conclusion.) sample (generic) n = 6, mean = 206, standard deviation = 10 sample (brand-name) n = 9, mean = 187, standard deviation = 14