Question

check my answer please will medal


A building manager installs sensors to see how often people turn of the lights when they leave a room. After a month the manager has sample size of 400, a sample mean of 47%, and a sample standard deviation of 4%. What is the confidence level for a confidence interval of 46.6 to 47.4

A99.7%
B 85%
C 68%
D 95%
I think it's d

Answer 1

@jim_thompson5910

Answer 2

Hi, I will try to help

Answer 3

Ok

Answer 4

The figures in your problem are inconsistent with the data.
The sample std deviation is not and cannot be .04 (4%).
the sample std dev is sqrt[(.47)(1-.47)/400]=.02495.
The margin of error from your CI is .474 -.47= .004 (very small).
This would represent .02495/.004= 6.24 std dev. from expected, which would have a very
high level of confidence (99.99.. %). Something is likely wrong with the figures in your problem.

Answer 5

@Dianie are you there

Answer 6

@Dianie what is going on you are not answering me

Answer 7

I gave you the answer:
he figures in your problem are inconsistent with the data.
The sample std deviation is not and cannot be .04 (4%).
the sample std dev is sqrt[(.47)(1-.47)/400]=.02495.
The margin of error from your CI is .474 -.47= .004 (very small).
This would represent .02495/.004= 6.24 std dev. from expected, which would have a very
high level of confidence (99.99.. %). Something is likely wrong with the figures in your problem.
A. is the answer because it is close to 99.99%

Answer 8

Ok how did you find that answer

Answer 9

With my brain and I searched it on Google to double check so I copied it from Google.

Answer 10

@satellite73

Answer 11

why @satellite73

Answer 12

I want at least two opinion to be completely sure thanks for the help

Answer 13

your welcome but I will still stay

Answer 14

Please read what she says Diane as she explained her reasoning. If you cannot read it, as seems plausible due to your rude response to help, please learn to read english or translate it using a convenient site like google translate.

Answer 15

It is in English

Answer 16

nto another language to have to translate it and google translate is not even right all the time

Answer 17

Ok thank you again I get it now I saw it but I didn't understand it

Answer 18

ooohhh

Answer 19

then say that, it's a great way to have someone help you learn

Answer 20

@FibonacciChick666 go away

Answer 21

thanl you for saying that

Answer 22

@Zarkon can you fan me so I can message you

Answer 23

Thanks for the help but it was d

Answer 24

Ohhh I am so sorry.

Answer 25

You may like this reference: http://onlinestatbook.com/2/estimation/mean.html