Steve believes that his wife's cell phone battery does not last as long as his cell phone battery. On ten different occasions, he measured the length of time his cell phone battery lasted and calculated that the mean was 24.1 hours with a standard deviation of 10.3 hours. He measured the length of time his wife's cell phone battery lasted on eight different occasions and calculated a mean of 16.8 hours with a standard deviation of 7.8 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. Step 2 of 2: Interpret the confidence interval obtained in Step 1. Answer 1 Point E Tables E Keypad Keyboard Shortcuts O Since the confidence interval contains zero, the data do not provide evidence that the population means are unequal at a 99% confidence level. Since the confidence interval does not contain zero, the data do not provide evidence that the population means are unequal at a 99 % confidence level. We are 99% confident that the mean battery life of Steve's cell phone is between 5.6 hours and 20.2 hours shorter than the mean battery life of his wife's cell phone. > We are 99% confident that the mean battery life of Steve's cell phone is between 5.6 hours and 20.2 hours longer than the mean battery life of his wife's cell phone. Prev Next

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