00:01
Hi, i'm david and i'm here to help you answer your question.
00:03
Now let me bring up your question here.
00:06
In this question here, when you discuss about the common interval for the mean, let me remind you that the company interval for the mule, it will be the x bar plus and minus the t m minus 1 degree freedom, and then unfound over 2, then with the s over square of n.
00:27
This will be for the case then the sigma is unknown, and we will have another form.
00:34
Formula when we have the z nphal over 2, 10 when the sigma of square of n.
00:40
This will be the sigma is known.
00:45
Now in this question here, we need to find the sample size such that we want to have the matching of the error.
00:52
It will be no more than the 012 owns.
00:58
So it means that in this formula the quantity here, it will be called the matching of the error...