00:02
Hello, so let's really look at the information we have in this question.
00:09
So here we have a 99 % reliability.
00:12
That is going to be our confidence level.
00:20
Our standard diffusion is 15.
00:28
Our margin of error is 5.
00:37
You want to find the sample size.
00:41
And let's look at the formula.
00:44
That is the z value at our value.
00:48
2 times standard division divided by margin of error all squared.
00:58
So to find the sample size we will need the z value.
01:03
So to find the z value we use, we will need alpha, which is the level of significance.
01:16
That's one minus the confidence level...