AP Stats Test Quick Review: Significance Testing

[@bfbunny]

Taking ap stats tomorrow, your video is saving my life. Great explanation of so much content in such short time

[@mporinchak]

Good luck!

[@bfbunny]

@@mporinchak Thanks!

[@frenchfrie1946]

I just watched all 14 of these videos and you sir have made me more confident than any amount of hours I spent in my online class learning this. Thank you. My test starts in 11 hours, so wish me luck on that 5!

[@mporinchak]

So glad they helped you!! Thanks!!!!!!!!!

[@frenchfrie1946]

@@mporinchak Coming back to these videos for my final and I will let you know, I am 95% confident that my AP Stats test score is a 4 or above.

[@rajanreddy200]

@@frenchfrie1946 what did you end up getting?

[@frenchfrie1946]

@@rajanreddy200 I got a 5! Amazing videos, I recommend them to everyone

[@bryceli2052]

@@frenchfrie1946 That's so awesome! Go you! I'm shooting for the same :)

[@sebassmeinking3713]

You deserve more recognition, these videos are outstanding

[@mporinchak]

Sebass Meinking thanks!!! Glad they helped you!! Maybe someday I’ll get that recognition!

[@Nic_17175]

commenting again because i CANNOT OVERSTATE how amazing these videos are. I've always gotten really good grades in math, but watching literally 2 or 3 hours worth of your videos has given me more understanding of actual concepts than I've ever had. Undoubtedly, you are the best teacher I have ever come across. literal lifesaver for my AP exam, and for my future math classes. I've never enjoyed math until the last few days, when I started watching your videos.

[@mporinchak]

Your comments are very appreciated!!! Glad I can help!

[@loagn9075]

Im taking my ap stats exam tomorrow, and man, these videos are so helpful for review. Thank you

[@mattiemcgov]

Thank you so much for helping me refresh on the content from the year. I've been gone from school way too long and would probably get a 2 on the exam without your videos :)

[@alejandramartinez6581]

I just watched your whole AP review playlist and I can not thank you enough. You are such a great teacher and helped so much! idk what i would've done!! Thank you!!

[@mporinchak]

That is awesome to hear! Glad I could help est of luck on the exam!

[@tayloraguinaldo9002]

i had to come back to comment after my ap test to say thank you for helping me so much 🙏🏽 your review videos are so great and helped me learn beyond how to do stats problems but understand why the answer works!! test felt so easy, best ap stats review out there!

[@user-od9pe3zp8f]

This man is the GOAT, keep killin the game Mike

[@mporinchak]

Thanks Duncan much appreciated!!!!

[@kaleokawamura2648]

thank you sir. your videos are amazing and ive learned more in these

[@mporinchak]

That would be great! Thanks!

[@soqudain]

Thank you for all of these videos! They’ve been so helpful as I cram for the AP test!

[@thatweirdscienceguy9880]

THE CRAM IS REAL!!!

[@thatweirdscienceguy9880]

@TheEnderFighters honestly, I'll be happy to pass lol. The inference section is going to kill me... like the confidence intervals and Chi-Square stuff

[@Yoshilover68Nintendo]

Howdy crammers!

[@NikhilGarlapati]

@@thatweirdscienceguy9880wait a minute I feel like I have seen you on HGAP videos from last year or something....

[@thatweirdscienceguy9880]

@@NikhilGarlapati you might have. I took AP Human Geography and a couple other APs last year.

[@leonelbaskin6045]

For the One sample t test problem at 20:32, i think the alternative should be mew is

[@racheljeanquinn7872]

thank you, your videos are very straightforward and helpful :)

[@ryanlian7656]

This man is actually fire

[@mporinchak]

I am blushing, thanks!!!!

[@jacobjensen5140]

So for the 2 proportion z-interval, when are you supposed to pool? Is it that you don't pool for confidence intervals but do/should for the actual test?

[@mporinchak]

Yes, you do not pool for a 2 sample z-interval becasue there is no assumption of a null hypothesis being true. You only need to pool in a test between two proportions where there is a null that they are equal. Also, the pooled value is only used to calculate the standard error and no where else. Lastly, it's also ok if you forget to pool for a test, as the results won't be that different and you can still get full credit on the test.

[@emmarosas9125]

A couple minutes before my test, just wanted to thank you.

[@mporinchak]

No problem Emma, hope you did well!!!!

[@ellienolan2242]

These videos are so helpful!!!!! Make him famous

[@jacobjensen5140]

Also, when it comes to determining degrees of freedom for t-tests, when you plug the data into a calculator's t-test function, the degrees of freedom are less than those calculated and they're decimals. I understand that one is a conservative estimate and the other is the precise value. On the AP test, is there one we should use over the other?

[@mporinchak]

An estimate is totally ok on the AP test. The precise formula for degrees of freedom is quite complicated and not worth the time to use. using one of the two estimates, either the degrees of freedom from each sample added, or the smaller of the two is totally fine.

[@mporinchak]

GOOD LUCK ON THE TEST THURSDAY!

[@Al-Tucsoni]

The people's champion

[@michaellewis7861]

why do much memorization how we derive stuff.

[@andrewqin29]

LIFESAVER!

[@eulibot]

t-12 hours

[@kevinsi6325]

iloveyou❤❤❤

[@gokartish]

guys guys guy, what the hell is bootlace????? 2019 stats exam boys know