00:01
Okay, here is my z curve or standard normal curve, but the mean is zero and the standard deviation is 1.
00:11
And i want to work at a value of z, which i will call z1 for clarity, where this area up here, so chance you're above z1 is 0 .2033.
00:29
Now to do this in a calculator and the first thing i'll do is i'll find the area left of the point i want to find and that will be 1 minus 02033 which i work out on the calculator 1 minus 02033 is 0 .7967.
00:55
And to find z1 then, i need to use the function inverse norm on the ti84 plus calculator.
01:07
And if i do that, well to get that, i press second, the blue button, second, vars, vars, just below the arrow keys.
01:17
And then you select the third one down, inverse norm.
01:21
Enter that and it says area first.
01:25
The default is the area left of the point you want to find.
01:30
In the case here, the red area i've shown.
01:33
So i put in point 7967 for the area.
01:40
Type it in, 7967.
01:44
It then says mu, that's the mean, which is zero.
01:48
It then says sd, which is one...