00:01
This is a chi -squared question, so the degrees of freedom given here, degrees of freedom denoted by df, that was given as 12 here, and we have to find the area between those two numbers.
00:11
So the lower boundary, let's say this is x1, which is 3 .57, and the upper boundary, which is x2, that was given as 21 .0.
00:19
Let me define a random variable x for this random variable, so i can denote this area as the lower boundary, and x, and the upper boundary, 21 .0.
00:29
To get this one here, this area, i'm going to use the graphing display calculator application.
00:34
Let me just show you how we can get, press second, and then variance.
00:37
At the bottom of the page, there is the chi -squared cdf, so i'm going to use the chi -squared cdf here...