Question

Suppose that a company claims that its batteries last 240 hours on average. It took many large samples, and each time the mean number of hours was outside the 95% confidence interval. Based on this information alone, which of the following is probably not the mean number of hours that the company's batteries last?
A. 240
B. 230
C. 225
D. 235

Answer 1

a i think

Answer 2

okayy

Answer 3

wanna see something cool

Answer 4

i beleive its c

Answer 5

because if it was 250 hours

At the 95% confidence level, your confidence interval is (250 - 1.96(standard deviation)/(square root of number of samples), 250 + 1.96(standard deviation)/(square root of number of samples)). Since the number 1.96(standard deviation)(square root of number of samples is probably small, the only likely number to be outside the confidence interval is 235. From the wording of the question, there is no way to tell for sure, however.

Answer 6

@kevin7510 ........ it's no use........ she already closed this question...

Answer 7

i thought it was C too

Answer 8

yea that guy did it wrong

Answer 9

@countryrockbabe

Answer 10

dang okay