Hypothesis Testing - Z test & T test

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Hypothesis Testing - Z test & T test

Рет қаралды 95,297

Pax Academy

Күн бұрын

Пікірлер: 78

@akberali4866 Күн бұрын

Thank you for everything, i’ve an exam in 2 hours and it’s not just that i was struggling with critical values that you’ve helped with. But the calming and soothing way of teaching is what made me at ease. Again thank you so much of this :)

@jewelminor5526 6 ай бұрын

You are able to make learning so stressless. Thank you.

@fabiolasilva6623 6 ай бұрын

I had never seen such an amazing explanatio , thank you so much!!!!!

@malvikapant7622 8 ай бұрын

crisp and clear. Thanks for the simplification

@pax_academy 8 ай бұрын

Glad it was helpful!

@Shrutimmmmm 4 ай бұрын

Thanksssss for such a crisp n clear explanation!!!

@pmicozzi 2 ай бұрын

Bravo…please make more videos…you make the complicated easier to understand!!! TY

@joshuaguzman202 3 ай бұрын

Ur insane this made it so clear unlike my lecturer who made it so convoluted

@keerthikas999 2 сағат бұрын

thank you

@alanon2572 3 ай бұрын

Day before the exam and here I am

@Aryanm0503 3 ай бұрын

My exam is after 2hrs😂

@wardakashif2469 3 ай бұрын

3 hourse before the viva and I'm here😂

@nancykamau5915 8 ай бұрын

I got it now. What a nice tutorial

@Star_Handler 8 ай бұрын

Great video! This really helped me understand my statistics homework so much better 🎉

@pax_academy 8 ай бұрын

Glad it helped!

@BradleyWek 2 ай бұрын

Thank you it's useful

@haifaelhassan2436 10 ай бұрын

Great to-the-point explanation 🙂Many thanks

@pax_academy 10 ай бұрын

Thank you very much!

@echezonajasmine8747 Ай бұрын

How did u get 0.01 in the rejection region and 0.025 in the rejection region

@kanakanakanakanameki2055 7 ай бұрын

Thank you so much i appreciate it. this is very easy to understand

@Joxora 3 ай бұрын

Thank you sir. Well expantiated and understood😊

@yashgupta4099 3 ай бұрын

All doughs cleared Man ❤😊

@engelnkosi7002 28 күн бұрын

what if the mean is not given? how do i calculate?

@dorinalarionov6792 3 ай бұрын

Thank you It’s really helpful

@eynjel2 4 ай бұрын

Thankyou for clear explanation ❤

@matthew1028-n2i 4 ай бұрын

Sorry, I have a question about the Z test. Why did you find the critical value depends on the standard deviation of 0.025 instead of 0.05? Is it about one tailed test and two tailed test? Thank you!

@happy_ritwika 3 ай бұрын

When the Alternate Hypothesis is "not equal to" the population mean, then we use a two tailed distribution. In a z or t test for a two tailed distribution, we find the z score or a t score for "alpha/2" because the critical value lies on each side of the mean. So if the Confidence Level is 0.95, then the Level of Significance is 0.05. Then alpha/2 = 0.05/2 = 0.025. If the Alternate Hypothesis is a "less then" population mean kinda scenario, we use a left tailed distribution. Then the level of significance is not divided by 2. So it just remains alpha. And we calculate the z and t test for alpha. Hope this helps...

@joeycaunsag4245 3 ай бұрын

I'm confused, what if we are dealing with sample standard deviations yet the sample size is more than 30, what's the statistical test

@kiwifrenchie6036 2 ай бұрын

I think it’s just depending on if we know the population variation. If yes use Z if not use T

@aimanmari349 6 ай бұрын

So helpful Thankyeww so muchhhhh❤️

@mansaproduct1982 10 ай бұрын

when calculating for the t-value, why is the degree of freedom not applicable (n-1)?

@pax_academy 10 ай бұрын

Thank you for your question. I think what you're asking is why do we use the degrees of freedom when calculating the critical value and not the t-value. The reason we use degrees of freedom to find the critical value is because the t-distribution's shape changes depending on how large the sample size is. As the sample size increases (degrees of freedom increases), the certainty of the estimate increases which leads to less spread in the distribution.

@tanishpawaskar2980 9 ай бұрын

Thank you so much it really helped me

@pax_academy 9 ай бұрын

I'm glad it helped!

@sarasultan1745 8 ай бұрын

You helped me a lot thanks

@pax_academy 8 ай бұрын

No problem!

@sajanyerra 10 ай бұрын

Hi! thank you for the very clear explanation. One question though, in the t-test we took 'Null Hypothesis as price = 2.45', can we also take it as 'price

@pax_academy 10 ай бұрын

Absolutely, you can also choose to state the null hypothesis as

@sajanyerra 10 ай бұрын

@@pax_academy thank yo very much, for responding :)

@chalseabito962 6 ай бұрын

Thanks alot 🙏🏾🙏🏾but please what's that chart called

@selmaamar532 6 ай бұрын

So helpful

@iraafzal5219 6 ай бұрын

Thank you so much ❤❤❤❤

@TamunokuroJohn-xb2tg Ай бұрын

❤

@atheaautida4886 3 ай бұрын

thank you thanj u!!!!!!!!!

@elcinogretmen 8 ай бұрын

Thanks a lot for sharing🎉❤

@pax_academy 8 ай бұрын

My pleasure !

@raizaya 10 ай бұрын

very helpful thank you

@pax_academy 10 ай бұрын

Glad it was helpful!

@BSN4year 3 ай бұрын

Unable to understand 😭😞😭😞

@a7med_kt897 25 күн бұрын

Really? I found this one is really clear

@samsonisaac3476 9 ай бұрын

What test is used when n>30 but then pop. variance is know

@pax_academy 9 ай бұрын

Thank you for your question. The test used when the sample size is higher than 30 or if the pop. variance is known is the z-test.

@SammykeyzMachaa 9 ай бұрын

Great 👌

@pax_academy 9 ай бұрын

Thank you!

@bangtri347 9 ай бұрын

I have a question for the second problem, shouldn't we be using the value corresponding to df=24 and CI=99%? Why did you use the CI value within the 98% CI?

@readingeducationjourney 9 ай бұрын

Because of the degree of freedom, i guess

@pax_academy 9 ай бұрын

Bear in mind that this is a one-tail test, therefore our significance level is calculated from doing 1 - CL of 99% = 0.01. If it were a two-tail test we would find 0.005 (0.01/2). Hence, we use the degrees of freedom found (24) and our signif level of 0.01 to find a critical value of 2.49.

@bangtri347 9 ай бұрын

@@pax_academy Oh okay, I understand now, thank you very much. Hope you continue making educational videos on Statistics!

@tehreemanwaar 10 ай бұрын

informative video 😃

@pax_academy 10 ай бұрын

Thank you!

@JavierBonillaC 8 ай бұрын

8:28 we cannot reject the hypothesis that the value is 75. Alright. But I would have loved for you to involve the 95%. That means that you can be 95% sure that the age of women in the US is 75. Right?

@anuj8825 3 ай бұрын

I don't think 95 can be involved anymore. 95% would have been the confidence interval in case we rejected, which means that if we sample the population enough times, 95% of the times the mean of the ages will give you an answer which is NOT 75. The number 95 says nothing about the original average of 75 years The confidence interval is to support the rejection, but says nothing about confidence of the null hypothesis data