00:01
The number of standard deviation away from the mean would be z alpha by 2 where z is the z factor.
00:27
Now the standard normal deviation is symmetric in nature.
00:45
Also the area between minus z alpha by 2 and z alpha by 2 would be 1 minus alpha that is minus where this alpha would be area in the tails of the distribution of the distribution.
01:25
Now the area to the left of z alpha by 2 would be 1 minus alpha by 2.
01:44
So that is the area to the left of z alpha by 2.
01:47
Now comes to the first part that is for z alpha by 2 is equals to 1 .96 that is 9.
02:02
So in this case area to the left of 1 .96 would be 1 minus 0 .976 that comes out to be 0 .025.
02:23
So alpha would be 0 .05 and the confidence level would be 1 minus alpha that is 1 minus 0 .05 comes out to be 0 .95 or we can say that 95%.
02:56
Now for this second part for z alpha by 2 is 2 .17 that is 7.
03:10
So in this case, wait a minute, that is 7.
03:14
Wait, wait, wait, 2 .17.
03:17
Now in this case, the area to the left of 2 .17 would be 0 .985 alpha by 2 equals to 1 minus 0 .985.
03:44
Wait a minute.
03:50
So after this, we get 0 .015...