Question

Suppose that a company claims that its batteries last 250 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. 245
C. 250
D. 235

Answer 1

@jim_thompson5910

Answer 2

does it give you the confidence interval?

Answer 3

is it D?

Answer 4

which one is that?

Answer 5

I'm not sure on this one because it seems like info is missing

Answer 6

i know, it does looks like but its complete

Answer 7

does this help? https://answers.yahoo.com/question/index?qid=20130820184713AAbTt1t

Answer 8

not really since I still don't know the CI

Answer 9

is CI the sample?

Answer 10

CI stands for confidence interval

Answer 11

which is the sample in a problem?

Answer 12

so should I try C?

Answer 13

i mean D

Answer 14

I'm not sure.

Answer 15

:( what do i do?

Answer 16

Maybe other users like kropot72 would know, but sadly I don't at the moment. You may have to ask your teacher.

Answer 17

@kropot72

Answer 18

o lol your the infinite sign

Answer 19

do you know?

Answer 20

@aum @Hero

Answer 21

The correct choice is C, the reason being the Confidence Interval would have been based on the expected population mean of 250 hours. The means of "many large samples" were all outside the 95% Confidence Interval which was based on the expected population mean of 250 hours.

Answer 22

Thank you very very much, i got it right ;)

Answer 23

Cool! You're welcome :)

Answer 24

agree with kropot

Answer 25

thanks for the help! @jim_thompson5910 @kropot72 :)