00:01
We have a data set here, the percentage of the population of each state that have bachelor degrees.
00:07
And we want to look at the data point of 18.
00:10
In which quartile does 18 lie? so quartiles split the data up into quarters.
00:17
The first 25%, or the smallest 25 % will be the first quartile, second 25 % of the second, and so on.
00:25
And to work out where these fall, we want to look at, so the first quartile, the cutoff point is n plus 1 over the fourth piece of data.
00:35
So we have 50 states here represented.
00:38
Let me just check we have all 50.
00:40
Yep, we do.
00:41
So that would be 51 over 4 or the 12 .7 fifth piece of data.
00:50
The second quartile, cutoff point.
00:53
So this is for the end of the first quartile.
00:57
This is the end of the second quartile, also called the median.
00:59
N plus 1 over 2th piece of data.
01:04
So 25 .5th...