Hypothesis Testing - Solving Problems With Proportions

This statistics video tutorial explains how to solve hypothesis testing problems with proportions. It explains how to calculate the sample proportion and the z-test statistic and how to compare that with the critical values in order to determine whether or not if you should accept or reject the null hypothesis at a specified confidence level or significance level.

Confidence Intervals & Margin of Error:

Find The Z-Score Given Confidence Interval:

Student's T-Distribution:

Hypothesis Testing - Null & Alternative:

Type I and Type II Errors:

One Tailed and Two Tailed Tests:

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Test Static For Means & Pop Proportions:

Hypothesis Testing Problems:

P-Value Method - Hypothesis Testing:

Hypothesis Testing - Proportions:

Difference of 2 Means - H Testing:

Cohen's D - Pooled Standard Deviation:

Hypothesis Testing - 2 Proportions:

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Matched or Paired Samples t-Test:

Chi Square Test:

Chi Square Distribution Test:

Test of Independence - Chi Square Dist:

Final Exams and Video Playlists:

Full-Length Videos and Worksheets:

[AbdullaHernandez]

Another tip for anyone who reads these comments is that when finding the p-value for 0.90, it similarly is between two different values for 1.28 and 1.29. Rather than taking the average of both of these, which would still be inaccurate, you can set up a proportion. Set up a proportion where 0.89973 is to 1.28, as 0.90 is to x. x, of course, will be the value you are looking for. I set this up as .89973 over -1.28 = .90 over x. In the end you get 1.280384, and so on for a few more decimal spaces. So it is closer to 1.28. I hope that was helpful.

And thank you for these videos, this is extremely helpful, and yes to err is human - all the best!

[Danieljordan]

Awesome video. Nevertheless, the tutor made a mistake in the second problem: he shoudn't divide the alpha area because this is an one tail problem. The z value is 1.285 aprox.

[sirasidibe]

paying over $2k for a stat class and almost failing but I'm actually learning and understand for FREE on YouTube.TYSM! These vids literally are saving me from failing. Ive watched other stat videos but this does it I swear!

[ErtOzk]

Last question is not two side, you made an error with dividing the alpha.
Passed. Thanks :D

[missnurse]

THANK YOU!! For taking your time to explain each step of the problem instead of throwing in a lot of fancy terms and a lot of blah blah l searched over 20 videos today for a simple explanation and couldn't find it until I seen your video.... Thanks a million!!

[insaf_]

I know a couple people mentioned it already but in case you missed the notifications, its a one tail test. so Zc= 1.28

[huffypuff]

Thank you SO much!! The amount of relief I feel when I see you have a video covering the topic I am stuck on... You've been the goat for years

[Jennyofthesky]

I am so greatful for these Thank you so much man. I love the way you carefully explain EVERYTHING you do, and I love how you always have a PERSON who is giving out H(1). It is so much clearer to determine H(1) when you say “The market manager does not believe this is true”

[borisszeto]

Thank you for your teaching video, you are the best professor on youtube who saved my GPA

[valendioah]

all of your video are easy to understand, with a good example and explanation, its very help me to study, thxx

[mindoII]

you doing more than my teachers u deserve my tuition fee 🤧

edit: got a good grade because of u

[HappinessYata]

This is so well explained. I was struggling a lot with that.

[sylviogiraldes]

Great example. Objective and complete. Thanks for sharing.

[majjoor]

Thank you for the video. Just a comment regarding the last example; you calculated Z value based on two-tails assumption, but the example provided is a right-side one tail example. Z-value would be 1.28 instead of 1.645. In both cases Ho will be rejected. I think you wanted to illustrated the different calculations when the problem is one-tail or two-tails hypothesis testing.

[augustinemulai]

Thank you, sir! Your videos had helped me a lot. You are a great teacher! Kudos!

[nurulbalqis]

In the 2nd question, the alpha does not have to be divided into 2 right? the whole alpha is on the right tailed side

[talkingkangaroo]

For Q2, why do you use Z of 1.645? Isn't this a one-tailed test where the 10% rejection region is all on the right tail?

[URANUSguys]

Im taking a re-test for the statistics course this sem, even if i pass it i can only have a D grade, if only i had seen these videos on time i could have gotten atleast a b+.

Last sem i barely passed the prob course, which you have also covered in this playlist. I barely passed the course!!😭.
i wish i had seen these videos before!!

[Dark_matician]

I have an exam on this today.
I hope this helps me.

[richardl.]

Why did you use 1.645 in the second question when our alpha is only 1 tailed? Isnt the critical value supposed to be 1.285