00:01
So we're referring to another question, which we're dealing with the red spiny lobsters, and we have the mean trap spacing as the variable that we're looking at.
00:15
And we know that we want to have 95 % confidence in that mean, and we know we want the width to end up being no more than five meters, meaning that our sampling air is we want to end up being 2 .5 meters.
00:35
And i went back to that problem and calculated the sample standard deviation for that data.
00:41
I have as 11 .625 meters.
00:45
And so we need to determine what sample size or how many teams we would have to use.
00:51
And we know that for our confidence interval for a mean, we know we take a z value standard variation over the square root of n, and that this is our sampling error.
01:04
And when we solve for n, we end up getting n is equal to, and we'll end up with a z squared, a sigma squared, and then divided by a sampling error squared.
01:14
Now, we don't know this standard deviation.
01:16
We're going to assume that it is approximately equal to this value...