00:02
A scientist counts the number of inclusions in a sample of 30 termaline rocks, each of weight 50 grams.
00:13
If the sample mean number of inclusions per gem is 11 .154, and the sample standard deviation of the number of inclusions is 3 .2022.
00:26
Calculate the standard error of the mean number of inclusions.
00:30
Now, if we're going to do a 95 % confidence interval, which is what we're going to do in part b, i'm going to set this up for that process, and then i will highlight or show you what the standard error of mean would be in it.
00:50
So we're going to take 11 .1504 plus or minus 1 .96 times our standard deviation, which is 3 .2022.
01:02
Divided by the square root, excuse me, of our sample size.
01:06
Now this part right here, when we calculate this, that is going to be our standard error of the mean...