Question

Statistics

Answer 1

Suppose that a customer service center claims that the telephone calls it receives last 113 seconds on average, with a standard deviation of 9 seconds. If you took a sample of 324 telephone calls, which of the following mean times would be within the 95% confidence interval?

A. 114.5 seconds
B. 115.5 seconds
C. 113.5 seconds
D. 116.5 seconds

Answer 2

ok so i got 113 plus or minus 2

Answer 3

@jim_thompson5910

Answer 4

I say its C what do you think?

Answer 5

one sec

Answer 6

oops i closed it

Answer 7

yea @jim_thompson5910

Answer 8

I'm getting (112.02, 113.98) for the CI, so C is the only thing in there. Looks good

Answer 9

k thanks very much

Answer 10

its correct ;)