Steve believes that his wife's cell phone battery does not last as long as his cell phone battery. Onninedifferent occasions, he measured the length of time his cell phone battery lasted and calculated that the mean was24.8hours with a standard deviation of6.9hours. He measured the length of time his wife's cell phone battery lasted onsixdifferent occasions and calculated a mean of15.3hours with a standard deviation of4.1 hours. Assume that the population variances are the same.Let Population 1 be the battery life of Steve's cell phone and Population 2 be the battery life of his wife's cell phone.

Step1of2:

Construct a 90% confidence interval for the true difference in mean battery life between Steve's cell phone and his wife's. Round the endpoints of the interval to one decimal place, if necessary.