00:01
Hi, i'm david and i'm here to help you answer your question.
00:03
Now let me bring up your question here.
00:07
In the question here, where would you discuss about the confidence interval for the proportion? let me remind you that the confidence interval for the proportion b, it will be the point estimate b heart plus or minus zan 4 over 2 times with the standard of the error.
00:25
When the standard of the error equals to the square root of the p heart, times 1 minus p heart divided by n and the p heart equal to x over n.
00:35
In this question here, we're given the symbol n equal to the 400 x equal to 100.
00:41
Answer yes.
00:43
And from here we can find the p heart of the proportion of the yes equal to x over n equal to 100 over 400 equal to 1 over 4 and equal to the 0 .25.
00:56
And that will be the answer for the a, 0 .25.
01:01
For the b, once you find the point estimate for the standard error.
01:06
For the standard error, the form logobie square root on the b heart times 1 minus the b heart over n...