00:01
Alright for this problem we know the proper bleeding is 0 .6 and the sample size is 2 ,500.
00:16
Now i want to describe the shape.
00:17
So we have n -termp and n times 1 minus p both greater than 10.
00:25
So you have normal shape between distribution.
00:31
Next we've heard of mean.
00:33
Mean of p hat is going to be equal to p which is 0 .6.
00:37
Standard deviation of p -hap which is going to be square root of p times 1 minus p over n 10 .6 time 4 over 2 ,500.
00:53
Let's put that into the calculation see that that is that equal to this equal to 0 .0 so yeah.
01:11
Next we know out of the point is so sample proportion is 0 .63.
01:18
So we want to find the z score.
01:21
Now, to find that we have, let's see, 0 .663 times 2 from 500 is 1575...