00:01
Hi, i'm david and i'm here to help the answer your question.
00:04
Now let me bring up your question here.
00:06
Here we want to discuss about the critical value for the standard normal distribution.
00:12
And here we need to find the critical value for the 90 .5 comfort interval.
00:17
And to do this question, let me try to draw the graph of the standard normal for you.
00:22
It will have the bell curve like this.
00:25
And then we know that the middle one, it will be the mean meal.
00:29
And for the standard normal this one will equal to the zero and we need to find the critical value so that the value of the z here and on the left will be the minus z such that we will have the middle area it will equal to the 90 .5 % so the middle one now will be the 90 .5 % so it means then the left tail and the right tail it will equal to the 9 .5%.
01:05
Particularly if we want to consider the left tail only, it will equal to 100 % minus 90 .5 % we divide by 2 and will equal to the 9 .5 divided by 2, equal to the 9 .5 divinely 2 equals to the 4 .75 % and which is it will equal to the 0 .075...