00:02
We want to calculate the kai square and the p value under the assumption that it's equally likely to have a car crash any day of the week.
00:09
So we first need to figure out the expected counts.
00:12
We're given these observed counts, which totals 850.
00:16
So there's 850 car crashes.
00:18
And if it's equally likely, we're going to do 850 divided by 7, so that each day of the week we would expect to have 121 .4 .3 as our expected counts.
00:32
Going all the way across here.
00:35
And then we need to figure out, calculate the observed minus the expected, square that value, and divide by the expected value.
00:44
And so for the first one, for example, we're going to do 139 minus 121 .43, 17 .757 squared, and then divided by 121 .43 gives us 2 .54.
01:03
And then the second one, i would do 105 minus 121 .43.
01:11
Square that answer and then divide by 121 .43...