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.
00:06
In this question here we are going to discuss about the covalence interval for the proportion p.
00:13
The formula will be the point estimate b plus or minus the z n -4 over 2 times when the square root of the p heart times 1 minus the p heart over the n.
00:26
Now in this question here we toss the con -sqq.
00:30
68 times so n equal to the 68 and then 30 head observed so x equal to the 30 from this information here we can find the b heart the sample proportion equal to x over n so equal to the 30 over 68 then we get equal to the 0 point 4141 2 and then the question asking to find the sample statistic for the proportion of the head is and that will be the answer for this one so it will be the p heart it will equal to the 0 .444 1 2 and the standard error we know that the standard error it will be the quantity on here there will be called the standard of the error so the phone we can compute standard of the error equal to the square root of the p heart times 1 minus the p heart divided by n.
01:39
So if we compute we get equal to, divided by 68, taking the square root, get equal to the zubon 0602, and that's going to be the answer for the standard of the error.
01:57
And then the next one we need to find the value of the z score.
02:02
That will be the z of the unfound over 2...