In a case-control study of teenage suicide, interviews were...

In a case-control study of teenage suicide, interviews were conducted with the parents of 100 teenagers who had committed suicide and the parents of 100 teenagers who had died from other causes. Of the teenagers who committed suicide, 40 of them experienced substance abuse problems per their parents. Of the teenagers who died from other causes, 10 of them experienced substance abuse problems per their parents. The incidence of suicide among teenagers with substance abuse problems in the general population is: 50% 40% 10% Incidence in the general population cannot be determined from this study design

Transcript

00:01 Hi, i'm david and i'm here to help you answer your question.

00:03 Now let me pick up your question here.

00:06 In this question here, we are going to discuss about the conference interval for the difference between the two proportion, p1 minus the p2.

00:15 The formula will be the phh1 minus the ph2 plus minus the zn4 over 2 time with the square root of the ph1 times 1 minus phat1 divided by n1 plus p h2 times 1 minus p hod 2 divided by n2 where the p hath the formula equal to the x over n now in this question here we're given the two populations the boy and the girls so we have the boy and the girl so boy we will have the symbol n b it will equal to the 96 and we have the n girl and we have the n girl it will equal to the n girl it will equal to the 123 and then we will see that the suicide reported for the boy ex -boy it will equal to the 18 and the x -girl it is equal to the 60 and then from here we should be able to find the be heart of the boy equal to the x boy over and boy so yet equal to the 18 over 96, then we get equal to 0 .1a75.

01:37 Similarly, we can find the bhad of the girl equal to the xg over the n girl.

01:43 So we get equal to the 60 over 123.

01:47 And then we get equal to 60 depending on 23, equal to the 0 .4a78.

01:56 Now when we have the bhbh boy and bh girl, the question asks, let's let you find the 95 % confident interval.

02:02 It means that we need to find the z and 4 over 2.

02:07 And the 95 % confident interval and 5 % divided by 2 equal to the 2 .5%, which is equal to the 2 .0 .25.

02:17 If we look at the z table, this value equal to 1 .96...

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