Probability Rules with Two Way Tables (or Contingency Tables)

Рет қаралды 113,594

5 жыл бұрын

This video demonstrates several of the probability rules with a two-way, or contingency table. I include examples of probabilities with "or", "and", "given", and the complement rule. There are several types of probability that can be found from two way tables.
If you want to view all of my videos in a nicely organized way, please visit mathandstatshelp.com/ . It is free for anyone to use. Please share with others you know who are struggling with math topics or statistics.

Пікірлер: 85

@khaleeesi Жыл бұрын

Four years later and you are still saving people's degrees

@carlitosap1732 4 жыл бұрын

Hey really appreciate, you explained something that it took my teacher a whole hr to explain

@user-ls1mv3ny6s 15 күн бұрын

Wow I have my test in 30 minutes time and this video is very helpful…I love you ma’am !

@khanyisilemphupha589 Жыл бұрын

Thank you so much lady! 🙌🏽I've been struggling with two-way tables and this video helped me a lot! 🙏

@lybri5490 4 жыл бұрын

Thank you so much!!! I FINALLY understand after hours of studying, rereading the text, my notes, watching other videos, etc. Wish I had started here! You are amazing!!!!

@MathandStatsHelp 4 жыл бұрын

Check out my website. It's free to use. I have a lot of Stats videos. If a topic you need is missing, please let me know. mathandstatshelp.com/

@erickaguilar4645 4 жыл бұрын

@@MathandStatsHelp Shouldn't B, be 445 over 877?

@tintinagain8019 3 жыл бұрын

@@MathandStatsHelp thank you

@tintinagain8019 3 жыл бұрын

@Stella Roper your explanation was pretty detailed . I am taking notes lol thank you

@keightzales3002 5 жыл бұрын

Thank you SOOO much. I saw a tutor and watched hours and hours of other videos, but could not understand WHY I was getting something wrong on my practice test. I finally understand now. THANK YOU!

@MathandStatsHelp 5 жыл бұрын

I'm glad that you figured it out!

@Brandon-xp1ob 4 жыл бұрын

Thanks. Needed a quick refresher for the final.

@tshepomotau4354 10 ай бұрын

You are explaining this contingency table much much better miss. I am confidently going to teach all my learners this confidently. ❤❤

@laurajeffcoat336 2 жыл бұрын

I have literally cried out of frustration over this and 3:40 into this video it clicked. THANK YOU!!!!!

@MathandStatsHelp 2 жыл бұрын

Sorry you got so frustrated, but glad the video helped.

@izzahzamri2267 4 жыл бұрын

thank you so muchhhhh!!! i finally understand and can do my homework completely

@bluewindharp 3 жыл бұрын

Thank you, this helped me with a difficult last problem before my final assignment.

@isaackalidza1041 4 жыл бұрын

Thank you for this video. It was extremely helpful

@Thatgiftedhippie Жыл бұрын

this helped me so much for my stats exam tomorrow!! God bless! Thank you so much for sharing your intelligence!

@MathandStatsHelp Жыл бұрын

You're welcome! Good luck on your exam!

@eziomaiwuh649 Жыл бұрын

Thank you very much. The probability now makes so much sense.

@MathandStatsHelp Жыл бұрын

You're welcome! I'm glad the video helped

@stangabay2277 2 жыл бұрын

This is GREAT! Thank you! Thank you! Thank you! Explained given, and, and or! :)

@EddieStyle 4 жыл бұрын

Awesome video, thank you!

@damarleyw2867 4 жыл бұрын

Thank you so much this was so helpful 😊

@jbearproductions4067 2 жыл бұрын

How come with question A you put 187/394 but in question B you put 445/1550 which was the total instead of putting the total for the column as the denominator

@MathandStatsHelp 2 жыл бұрын

With "and" probabilities, both conditions have to be true. It's the total of both divided the total of people in the study. With "given", you know that it has to come from the given category and use the total from the given.

@serenading_beast853 2 жыл бұрын

Thank you so much! this was so helpful!!

@Xmahle_ 3 жыл бұрын

Thank you so so much for this !

@NK-iy6if 2 жыл бұрын

God bless you! Thank you so so so much! This video was of great help!

@MathandStatsHelp 2 жыл бұрын

I'm happy to hear it helped you! You're welcome!

@msraji1 8 ай бұрын

thanks for the clear explanation it is very helpful

@animemoments7777 9 ай бұрын

I love you!!! Thank you so much

@gappysithole7414 3 жыл бұрын

Thank you so much✨👏

@JobMan-kz8qp 10 ай бұрын

Thanks to you and the family that made you, because you're a real definition of an Angel since you teach with great skill and even make us understand whatever you teach with relevant examples. You're a real blessing indeed to the world and thank you once more.

@MathandStatsHelp 10 ай бұрын

You're welcome. I'm happy that I'm able to help so many people!

@tintinagain8019 3 жыл бұрын

So B can i use the formula to get the answer cause that way works for me

@patrickmayer9218 2 жыл бұрын

Thanks for the help, Stat midterm tomorrow!

@MathandStatsHelp 2 жыл бұрын

Hope you do well!

@davidcullinane7303 Жыл бұрын

Very helpful, thanks!

@MathandStatsHelp Жыл бұрын

You're welcome

@Letmegonot 3 жыл бұрын

How do we know what total we divide by that’s the confusing part to me?

@MathandStatsHelp 3 жыл бұрын

It just depends on the question. It changes from scenario to scenario. When it says given that, then you divide by the total from the given group. If it's talking about out of the whole group, you use the larger total. It takes practice.

@bellamoreno2620 2 жыл бұрын

Thank you so much!

@MathandStatsHelp 2 жыл бұрын

You're welcome!

@ccey7298 Ай бұрын

made it soo simple an ezyy i swearr

@tutorstats1155 4 жыл бұрын

Good job #TutorStats

@jannonflores1113 Жыл бұрын

Thank you, you saved my freakin ass. Earned a sub :)

@MathandStatsHelp Жыл бұрын

You're welcome! Thanks for subscribing!

@dianed4938 4 жыл бұрын

Wouldn't B be 445/877? It seems like the same question as A?

@MathandStatsHelp 4 жыл бұрын

It's different because you are looking out of all students how likely is it to pick someone who is both female and never volunteers. The other one they use the word "given" to tell you the total to look at.

@comfortbrown3618 3 жыл бұрын

@@MathandStatsHelp Thank you. I was confused as well.

@carolynesein345 2 ай бұрын

@@MathandStatsHelp what about if the question asks' find the probability of selecting a person who is a female given that they respond"Never volunteers"? I think the answer should be 445/779 for this particular case i.e,P(F|N)=445/779 and for the previous P(N|F)=445/877. Kindly clarify this two scenarios. otherwise thanks so much, you're doing a great job. I wish you blessings

@sserwaddaderrick1523 16 күн бұрын

Awesome

@user-qo5hl5lb9p Жыл бұрын

thanks that helped a lot

@MathandStatsHelp Жыл бұрын

You're welcome

@papichulo9040 3 жыл бұрын

how about a qn that mentions mutually exclusive

@fahadraza7916 4 жыл бұрын

isn't we divide 445 by 877 in P(female/never) ??

@MathandStatsHelp 4 жыл бұрын

If you are given to find P(female|never), yes it would be 445/877. The question I asked was P(never|female) so it is 445/779. They are different.

@Tomorrow646 4 жыл бұрын

@@MathandStatsHelp actually, you and mention Female, then the word Never. In both questions 1 and 2, you mention gender then their response afterwards. So why did your denominator change for question #2??

@MathandStatsHelp 4 жыл бұрын

In part a, it tells us that we are given the group sometimes volunteer. Our denominator is the group sometimes volunteer for that one, because we are only specifically given that they are from the group sometimes volunteer. The second one doesn't say given female or given never volunteers. Had it used the term given, then the total would be the given category. We are looking for out of all of the people surveyed how many were both female and never volunteers. Part A uses the "given" probability rule and Part B uses the "and" probability rule.

@purpp7993 Жыл бұрын

damn shordy u tryna be my math instructor

@reinhardjesmart169 4 жыл бұрын

There're Few comments bcoz of part B i guess..😀

@siphephelosphesihle4253 2 жыл бұрын

youre the best .

@MathandStatsHelp 2 жыл бұрын

Thank you

@serenityelf1147 2 жыл бұрын

bruh thankyou i really needed this i have a 64 in math😭

@MathandStatsHelp 2 жыл бұрын

You're welcome. Hope your grade can improve.

@Alhmdullah546 Жыл бұрын

Our teacher give us a low for Agiven B=pA and B/p(b)if p B not zero the answer differ in last q

@BRBHARDWAJ 4 жыл бұрын

How to identify 'and' 'or' situation

@MathandStatsHelp 4 жыл бұрын

Typically, it just says it in the problem.

@steveying1305 3 жыл бұрын

Very sweet voice

@octaviataylor9530 2 жыл бұрын

_This video helped a lot im a viral learner and I like how can see where to get my answers. thank you

@MathandStatsHelp 2 жыл бұрын

You're welcome. Glad to hear it helped you.

@kaylasarazin4815 4 жыл бұрын

On question 2 how come you put 445 over 1550 and not 445 over 877

@MathandStatsHelp 4 жыл бұрын

Because it's an "and" probability and you are looking for a person out of the entire group that meets both criteria.

@1l_ismael304 4 жыл бұрын

@@MathandStatsHelp hi :)

@uncertifiedlinguist8396 11 ай бұрын

Regarding problem D, P(male OR sometimes)= 771/1550 + 394/1550 - 187/1550 The 187/1550 is P(male AND sometimes) So how come when you multiply P(male) × P(sometimes), it does NOT equal to 187/1550? Madness.

@MathandStatsHelp 11 ай бұрын

You can only use the rule P(A and B)=P(A)*P(B) if the events are independent. These aren't independent events.

@tintinagain8019 3 жыл бұрын

as I am typing this question im asking myself what is the probability that she is going to answer me lol. For B why is it over the total number of people and not the total number of fermales

@tintinagain8019 3 жыл бұрын

lol saw below that you have already answered this question thanks a lot

@SureshChouksey Жыл бұрын

Why is it not 187/1550 since one can pick anybody from the sample

@MathandStatsHelp Жыл бұрын

Because you are told they responded sometimes. Given means that you know the given category is known to be true, so you are only looking at the total in the given group.