00:01
So you have that table of all those values and you have the group one data and then you need to find the x minus the mean.
00:09
Well, the mean of that first group is 17.
00:13
And so those values in the table will end up being, let's see, 4, negative 3, 1, negative 3, negative 1, and 2.
00:25
And so the squares of those values will end up being the 16 -91914 and then you can find those sums and then you have your group two data and you want the difference between each number and the mean and the mean is 13 so that value is let me get my column that is negative two three negative one zero two negative two negative two and so those values squared will give you a total of 491044 and then you can sum those values.
01:08
Now from this, your questions ask what is your first question asked to give the standard the variance of group one and you want the variance of group two.
01:23
And those values, just one second, let me give you that.
01:36
We get the variance, or the, well, the standard deviation of 1 is 2 .828, which is going to end up being just one second.
01:59
That value is 8.
02:01
And for the second group, the standard deviation, i'm going to give you that first, actually, again, is 2 .976, and the standard deviation, or the standard deviation, quick get that for you.
02:27
It's that value squared, but let me give you that calculation, is 4 .4.
02:34
Now, it looks like next you want to know what the standard error is for the difference.
02:42
And the standard error for the difference is going to be the square root of, and we're going to take the variance of the first, divided by the sample size, and the sample size was five, and then the variance of the second, which is that 4 .4, divided by the sample size, which again was five.
03:00
So that's going to give us for that standard deviation, and let me quickly give that to you.
03:06
The square root of 8 divided by 5 plus 4 .4 divided by 5, divided by 5...