Confidence intervals for the difference between two proportions | AP Statistics | Khan Academy

[@karannchew2534]

2:41 standard deviation of the sampling distribution of the sample proportions 6:00 standard deviation of the sampling distribution of the difference between the sample proportions 6:33 standard deviation of the sampling distribution of the difference between the sample proportions 7:46 the variance of the sampling distribution for the sample proportion of the first population (or of the first group, p1) 8:00 the variance of the sampling distribution for the sample proportion of the second population (or of the second group, p2)

[@sumkipkurgat2440]

thank you very much. still refer to this everydaty

[@waltsanders9951]

Wow, we just today started learning this in AP stat

[@henriettagibsonii3545]

Should be step by step no jumping from Billy to Jack, just the formula and plug the data in, much easier to follow.

[@Kamerick_]

Thank you...

[@my4337]

beautiful, thank you so much!

[@taladiv3415]

Yeay, Sal is still at it!

[@Cakemonster147]

Hi Sal!

[@VJ-ub7sc]

What if they are dependent?

[@josephculp6883]

They can't be if you want to find the confidence interval. If it is dependent it would be an unreliable statistic.

[@Urcristianoronaldo-m3n]

Awesome

[@junmingzheng7456]

Not sure if any one will see this, but here the sigma was calculated with p1(1-p1)/n1+p2(1-p2)/n2, yet back in another video,(kzbin.info/www/bejne/foDcf3iLbpmrgLM) the sigma was calculated with p_hat: phat(1-phat)(1/n1+1/n2), the phat being ( x1+x2)/(n1+n2), and there is no way these two things are the same, how do you explain this?

[@StarryNabz]

yo I see your post 3 years later. Still can't answer your question but I see you bud.

[@oskarowen7538]

How long where you in school for? Did you get principals award and the the best grades in you’re math class.

[@ayeshaqureshi878]

Sir kindly upload latest videos for 10nth class

[@moart87]

So this is how all those A/B-calculators on the internet work?

[@aytys013]

A=2r+z^2 B=z*sqr(z^2+4rq) C=2(n+z^2) Lower bound= (A-B)/C Upper bound =(A+B)/C Is better for making confidence intervals on a proportion! What you showed dosent work for many datasets we would encounter in real life!