00:01
So here, some of the size is given us 30.
00:05
The standard deviation is 0 .5477.
00:09
So the standard error will be equal to the sigma on the rate of n.
00:14
So we have 0 .54 -77 on the root of 30.
00:25
And this gives us 0 .1.
00:29
So the 95 % confidence we get alpha to 1 minus 0 .95 gives us 0 .05.
00:41
So our z critical will give us 1 .96 using the alpha.
00:51
So our margin of error will be equal to z times our standard error.
00:58
So we get 1 .96 times our standard error of 0 .1, which gives us 0 .196.
01:12
So when we come to the part 2, 95 % confidence interval gives z zc to be 1 .96.
01:28
Our margin of error will be equal to zc times the standard error, and we get 0 .493 for the part 2.
01:55
Since here you are giving n to be 30 stigma squared to be 1 .9 so our s ae will be equal to you have square root of 1 .9 over the rate of 30 and this will give us the root of 1 .9 over the rate of 30 so we have 0 .25 so we have 1 .9.
02:36
0 .996 times 0 .25.
02:44
And this gives us 4 .0 .493...