0:00
All right.
00:01
So in this question, we have female, male, rarely use, and then use seatbelt.
00:12
So rarely use is 220 and 323, 12, 35, and 1188.
00:19
And our test statistic is going to be kai squared, which is our sum of all of our observed minus expected squared.
00:33
Divided by our expected for all four different categories that we have there.
00:38
So in order to do that, we need to find our expected counts.
00:42
These are our observed counts.
00:50
So we need our totals.
00:54
I'm actually just going to do these in my calculator.
00:59
So our totals, 220 plus 323, that's 543, 1235.
01:10
Plus 1188, 2423, 220 plus 1235, 1455, 325, 323 plus 1188, that's 1511, and that's 2 ,966 total...