Comparing population proportions 1 | Probability and Statistics | Khan Academy

Comparing Population Proportions 1

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[prawz_]

"yellow and blue makes green"; Sal when are you going to start doing art class videos? :D

[Nina-kvvn]

Is this course, Probability and Statistics, available in PDF, Sal?

[jackt]

But what if there was Russian meddling....?

[NnRNoAh]

I wonder if we can use a chi-square test with this one.

[suuup]

I think there is an error related to sample variance denominators. they should be n-1 rather than n.

[dominicj]

what do u mean by sampling distribution for p1 and p2?

[shadmanmartinpiyal]

Sal, you could use ''m' subscript for male and "f" subscript for female.

[sombitchakraborty]

Can anyone please tell me what shall be done if we are considering more than two variables?

[sammybarasa]

Is it possible to calculate statistical difference between tow proportions from two unequal samples? it is easier when they are equal, but what if they are unequal?

[Userrag]

How has he drawn a sampling distribution using Central limit theorem? He says 1000 men constitute population. If so, what's the sample size has he chosen for the sampling distribution? I suppose this sample size is the number with which he has to divide population variance to get the sampling distribution variance! Not 1000 which he did!

[dcrock]

What if they used Smartmatic and Dominion voting systems?

[nabeelmohiRings]

this did not help me at all lol. if anyone else is trying to learn this mean comparison stuff look up brandon foltz. your other videos have been good Mr Khan, this one not so much. Thanks for making it however.

[sitbunnynow]

@FHomeBrew Just subscribe to the playlist of what you need to learn!

[haneulkim]

Thanks Khan! I have two questions.
1. What if there are more man then women, do we still sample same size from population with different size?

2. If I already have data of whole population in our case I have data for all men and women vote/no vote. In such case I don't need to sample for hypothesis testing and just use population?

[kowtharhassan]

Again if 60 % voted, how du u distribute this?

[BarbaraGonzalez-lv]

Davis Shirley Lee Cynthia Rodriguez Mark

[GSav]

That probability is called beta. It is the probability of a type 2 error

[kowtharhassan]

I don’t understand how u turned proportions into means. If 60 percent of men voted how does that make the 60 their mean?

[bcnicholas]

Man why is statistics so hard to grasp

[NMD]

@CogitoErgoCogitoSum I know it's been a month since you posted that question, but anyway, i believe you're talking about Type I Errors. You're lucky, Sal did a video about that, here's the link, put it after the youtube(dot)com part /watch?v=EowIec7Y8HM
Hope that helped.