# Confidence intervals and margin of error | AP Statistics | Khan Academy

## 51 thoughts on “Confidence intervals and margin of error | AP Statistics | Khan Academy”

1. Allen Ding says:

I’m early

Second

3. 912sonic says:

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5. İlber Kağan TURAN says:

https://youtu.be/pa8o6WNYJZI

6. asdFRap says:

what course is this from? on the website it only has high school statistics and it doesn't go into confidence intervals

7. christian cerda says:

So that standard error equation only works for 95% confidence interval correct?

8. Sairaj Bibinagar says:

The assumptions: Each person being asked to is independent, true proportion not too close to 0 or 1. How and Why are these assumptions essential in concluding that the sample proportion follows a normal distribution?

9. Ben Holmes says:

why dont u just do a simple version, you seriously overcomplicate it for those who are just trying to get a simple understanding.

10. Mike Garri says:

Thank you again!

11. Ryan Park says:

The handwriting in this video is phenomenal

12. Ryan Grant says:

Watching this just helped me pass a quiz that required a pass in order to not fail the entire unit. Thanks heaps, you're a legend!

13. shashank br says:

at 9.14 , why did you calculate twice the standard error while adding and subracting from samlpe proportion ?

Too complicated for someone trying to understand for the first time

15. steff says:

I bet 50% of this channel's success is due to this beautifully balanced handwriting

16. Shekinah Victoire Kabala says:

i'm so confused. how did u found 95%?

17. Ankit Bhardwaj says:

check you math its wrong it should be(0.49,0.59) not (0.44,0.64)

18. Ankit Bhardwaj says:

disregard that comment didn't watch until the end. Sorry.

19. Something Something says:

Thank u

20. SheStillRuns says:

I still can't make sense of the basic statistical premise. It really doesn't make sense to me.

21. SheStillRuns says:

what were we doing in the whole video?

22. SheStillRuns says:

What if the CI contains zero or one? From what I remember, it wouldn't be a statistically significant result then? I guess this is not possible when we're talking percentages, and is probably relevant only in the context of hypothesis testing? Is that correct? I DON'T LOVE statistics. It's too much assumption. Presumptuous "science".

23. Uche Obi says:

Good explaining once again. thanks!

24. Angel says:

25. Noah Carter says:

The issue that I have with this video is, after thoroughly over explaining population, sample, sample proportion, sample deviation of sample proportion and sampling distribution, he didn't have enough space to do a written explanation on how he got his Confidence Intervals and Margin of Error; which is ironic, being a part of the videos title and the only reason I clicked play 😉

26. Krishna Satish says:

Good explanation

27. Gin san says:

It would be nice if you state the Z critical value used in the 95% confidence, then it wouldn't be as confusing as for where you're getting the Confidence interval from.

28. Kemp Isabel says:

29. Matthew Johnson says:

anyone else here for Ms. Trieu's class??

30. Jordan Tait says:

Many are saying this is too complicated for an intro, and maybe so. With that said, I found this to be an excellent example. Great job!

31. 701william says:

you a literal LIFE SAVER

32. yousef yar says:

Perfect explanation. i dont need to read boring books

33. Utku Mert Topçuoğlu says:

I had fun while learning. Thanks!

34. Willem Delfos says:

Perfect! Helped me a lot

35. 史詩Epic says:

I want to ask why you don't need to times 1.96 which is the Z(a/2) to the margin of error?

36. Jordan says:

And you didn't think it was important to explain where the Margin of Error value comes from even though it's in the title?

37. Vanessa Espinosa says:

Wthhh how did he get 0.46 I’m lost

why did you not multiply the critical vale of z with it??

39. mariss K says:

Having the word problem written out first would have been better for me, so I can see the problem
Going through it this way is lost me

40. Gregorius Rex says:

Dude who uses a pie chart for a question about confidence intervals😂😂😂😂

41. jasir sofi says:

Can you plz upload lecture on Theory of Estimation

42. cacsoccer101 says:

Thank you so much! This last week of stats kicked my butt and I thought this was going to do the same. You really simplified this in a manner that was easy to understand.

43. Rudy Perez says:

where did he get the .46 for the SE?

44. J says:

that inference he made: that the true population proportion is within 2 sd of sample proportion cleared many questions for me. I was cofused before before watching this. thanks

45. Werner Vienna says:

Does anyone know what program he's using for drawing?

likely voters, cas America doesnt hv compulsory voting…

47. Muayed Haroon says:

i got 5.5 out of 10 in my stat quiz all of my marks gained from this video

48. George Owen says:

This guy is all over the place I need to make a video that streamlines the information rather than throwing out all these what if's to confuse people.

49. yannickinspain says:

I am in love with Sal

50. MINITITANZ says: