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)
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,(ruclips.net/video/HOyNEU94xJQ/видео.html) 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?
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!
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)
thank you very much. still refer to this everydaty
Wow, we just today started learning this in AP stat
Thank you...
Should be step by step no jumping from Billy to Jack, just the formula and plug the data in, much easier to follow.
Yeay, Sal is still at it!
beautiful, thank you so much!
Hi Sal!
What if they are dependent?
They can't be if you want to find the confidence interval. If it is dependent it would be an unreliable statistic.
Awesome
How long where you in school for? Did you get principals award and the the best grades in you’re math class.
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,(ruclips.net/video/HOyNEU94xJQ/видео.html) 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?
yo I see your post 3 years later. Still can't answer your question but I see you bud.
Sir kindly upload latest videos for 10nth class
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!
So this is how all those A/B-calculators on the internet work?