00:02
Hello students, in this question first we need to calculate the sample mean.
00:05
So we have some observations of the sample mean.
00:08
Here x bar is equal to 17 .1 plus 20 .1 plus 21 .1 plus 19 .1 plus 22 .1 plus 26 .1 plus 26 .1 divided by 7.
00:28
So therefore x bar is equal to 21 .0.
00:35
Next we need to calculate the sample deviation for each observation.
00:39
The deviation is the difference between each observation and the sample mean.
00:42
So here d1 is equal to 17 .1 minus 21 .0 is equal to minus 13 .9 minus 3 .9.
00:52
And d2 is equal to 20 .1 minus 21 .0 is equal to minus 0 .9.
00:59
And d3 is equal to 21 .1 minus 21 .0 is equal to 0 .1.
01:06
And d4 is equal to 22 .1 minus 21 .0 is equal to 1 .1.
01:13
And d5 is equal to 19 .1 minus 21 .0 is equal to minus 1 .9.
01:23
And d6 is equal to 26 .1 minus 21 .0 is equal to 5 .1.
01:33
And d7 is equal to 26 .1 minus 21 .0 is equal to 5 .1.
01:39
Now we need to square each deviation d1 square.
01:43
So d1 square is equal to minus 3 .9.
01:47
So here d1 square is equal to 15 .21.
01:56
Like that d6 is equal to 26 .01...