00:01
So let's compare the z scores of our two cases here.
00:04
In our first case, we have a raw score.
00:11
Let's compare our two cases here.
00:14
In our first case, we have a raw score of 90 with a mean of 72.
00:23
And a standard deviation.
00:29
Let's compare our two cases.
00:30
In our first case, we have a raw score of 90, a mean, of 72 and a standard deviation of 9.
00:42
So converting this into a z score is going to list 90 minus 72 over 9.
00:52
This is going to be 18 over 9.
00:54
So we get a z score of 2.
00:59
So a z score of 2 indicates that this score 90 is going to be at two standard deviations.
01:10
And what we know is that, let's assume that this is our graph.
01:15
At two standard deviations, so this is our mean, this is one standard deviation, and this is two standard deviations.
01:26
What this means is that at two standard deviations to the right of our graph, or of our mean, 95 % of the graph will be past this value...