00:01
Okay, so we've got three samples.
00:03
We've got one with sample size 28, whose standard deviation is 2 .7.
00:11
One with sample size 33, whose standard deviation is 2 .6.
00:16
And one with sample size, sorry, 102, whose standard deviation is 4 .8.
00:24
And they want to know whether the assumption of equal variance or equal standard deviations is reasonable.
00:30
Now, i think that it is because if you look at the ratio of s over root n, which is what you use in, you know, confidence intervals and hypothesis testing and stuff, it's very similar.
00:43
For all of them, it's about 0 .5.
00:46
So if you do 28, sorry, 2 .7 over square root of 28 and 33, sorry, 2 .6 of the square root of 33 and 4 .8 of the square root of 102, you get roughly the same number...