Lecture 19- Hypothesis Testing: T-Test, Z-Test

[@kartikkapoor2068]

this is the best well-explained video I have come across on this topic. Thank you so much, sir

[@preetigarg2k7]

u r videos are very clear....i am faculty teaching market research and i refer ur videos....keep posting

[@vandanabellani7585]

this is the best well explained video I have come across for this topic..thank you so much sir!!

[@brendanp460]

Very informative! Thanks for the tutorial!

[@NareswarBasumatary-us3nw]

Very good teaching Sir🙏

[@niranjana2411]

thanks for sharing the video.

[@no1crazyvideos568]

Sir very nice session. Very informative. Thank you so much

[@queeneva1985]

My brain was locked up as Iwas trying to understanding all thee concepts but this video unlocked my brain and I understand better now. Than you sir for such a great explanation 🫡

[@devicharan4310]

Thank u sir, I'm passing my exam beacause of u this time. Lots of respect.

[@vikasmjose3514]

Very informative ❤️, perfect ok 👍😂

[@najeemaelias1520]

Yayaa 😂😂😂

[@roshnanazar4801]

Pinallla😂🌝

[@gezashignmekonnen7738]

Thank you for your brief explanation!!

[@taherbagwala1151]

This is the reason why IIT is craze in our country. Quality of teachers is incredible

[@kasparmilinga1023]

Thank you Dr. Nayak for your lecture useful to me

[@charmeevora3873]

Sir how we can understand the 2 tail test which condition?

[@tusharkoli8515]

Sir your videos are superb and helped us a lot. We are waiting for your upcoming videos.

[@umeshbhaskar6833]

Samajh bhi aaya h

[@tusharkoli8515]

Ha bhai

[@amarkumar2836]

Please explain significant value??
Really nice explain..

[@MannyZevallos]

Sir, Great explanations.
I have the following questions. When using a country population with gender as the control variable for stratification as follows:
Males Strata: compose of Males with decease, Males without decease ( Control group)
Female Strata: Women with decease, and Woman without deceased(Control group).
I have a few questions
1) I am wondering if I have to calculate the the sample size of the entire population or should I calculate the sample for each strata individually.
2)
The problem that I ran into is that according to your explanation N= [(Z*SIGMA)/ d]^2
precision "d" was kept to 0.05, Z=1.645 for Alpha 0.05 and CI=95%, but I do not have SIGMA of the population. SO how do I find SIGMA... is this for SIGMA population or estrata
In a different publication I found Ntotal= [Z*/ d]^2 * [ Phat(1-Phat)], where Phat is a predermine value of sensitivity =90% ( or Specificity). Using the second method I am getting
Ntotal = [1.645/0.05]^2 * [0.9*0.1]= 354 ( If this the correct TOTAL sample size for my study? I think it is but I want to be sure. and the next question is can I divide my sample size in even stratas... say 177male and 177 female and could I further divide EACH strata in a test and control group evenly say:
Males Strata: compose of Males with decease (n= 89) , Males without decease (n =89 for Control group)
Female Strata: Women with decease (n =89), and Woman without deceased (n =89 for Control group).
So I am confuse above these two approaches
3) I read in the literature that I should consider using this table www.research-advisors.com/tools/SampleSize.htm
In my case for a 95 CI and a total population in a country of 10 million, the table indicate to use 384 samples.
But I need to know if this is for the entire experiment or for each strata as well... similar questions to the one above.
The numbers I calculated for the size of the sample in (2) = (354) are not too different to the ones on the table in (3)= 384. I am opting to use N=400 to opt for potential participants dropping the study.
I will truly appreciate your input.
Sincerely,
Manny

[@shantipriya370]

superb explanation...

[@manisha8bbhubbasanpal699]

What is the null and alternative hypothesis in mean and if we select the small or larger one actually i have assignment on this so plz help me

[@ashishtandon9649]

Very informative & useful video.....

[@naveench816]

Why is he going for 2 tail test when we know that given sample mean for Ha is greater than Ho?

[@shilpar3656]

Thank you was useful

[@dolsydhawan8407]

Thankyou so much. Very helpful

[@sasmitapanigrahi3127]

What is direction of test

[@daminikhawaskar6033]

Very informative

[@hemantdas9546]

Subtitles are not needed and are a big hinderance. By the way good video

[@shrujanamsyama9940]

RUclips has an option to disable it. It is an extra, not compulsory. If you don't like it, disable it.

[@StUDy_ToGEThEr260]

Very nice explanation sir

[@shameemmemon52]

Sir u r the best

[@dr.ashuroulet7462]

Nice sir..👍

[@flawfulpractice8381]

Can you please elaborate the concept of normal distribution

[@naveenmadanu8071]

Some more long distance if video is perfect

[@ramneekkaur5588]

Very well explained

[@dr.ashokkalam1430]

Good lecture.

[@mandeepthakur3305]

Hello sir, is that a rule of thumb that when sample size is 30 den v used t otherwise z,
As I have heard somewhere n some research paper has used t while sample size is more than 30.
So how can I know the status and be confident among z and t only on the basis of sample size?
How will it affect my study relaibility and validity if I used t instead of z?
Waiting for ur expert opinion,
Other opinion is also highly appreciated
Thanks

[@surabhi4880]

They both are same. Just the difference is in theri sample size. There is no Z test in the software as he has already mentioned in video.

[@jermaine2712]

Thanks 4 sharing.

[@preethikarthika2664]

Awesome

[@swapnilghosh3010]

Why the given example of gpa is two tailed?

[@mahimaagrawal6506]

Because outcome can be either more or less than 3

[@GauravSharma-ir6cf]

Best explanation

[@mehfoozaaziz9164]

Thank u sir

[@VirajiniUthayakumar]

Thank u so much sr ❤️

[@shaguftatariq7347]

Please let me know sir if small sample for test is 30 per cent of total population or 30 number of respondents

[@soumyanayak2898]

if population or sample size is less than 30 then t test is used else z test is to be used.

[@rajeshwarim4493]

Well explained sir

[@najmiinaabdalla3723]

Thanks to sharing this video

[@jeetendrasingh4735]

Very clear explanation

[@TeamCAEducationalInstitute]

Well explained

[@kaarmukhilnilavan9495]

Nice lecture Sir. Really informative

[@saurabhdhiman3189]

From where does this z= 1.96 came out, can anyone explain ??

[@RahulKumar-pt9mf]

Saurabh Dhiman that is Z critical value ! Which can be found out frm the z table .at 95 percent level of confidence

[@gyanendrasamal68]

1.96 means its a two tailed test, leaving 2.5% in each side of the normal distribution curve. so here the level of confidence is 97.5% at the Z value of 1.96. If it was one tailed test then at 95% confidence level the Z value would have been 1.645

[@shakirmalik3221]

Good Effort

[@MSDrathnayaka]

❤❤❤

[@poojajaiswal8324]

Thank u sir🙋

[@Praveen-ut8no]

Just came here to watch how the toppers r studying 😅😢😂😂

[@MusicWorld535]

good

[@ramch4167]

Good one thank you

[@umangd3959]

i like your vodeos

[@beenechilombwa3003]

Thanks boss

[@dr.balvinderkhurana9155]

nice

[@aplusacademy8993]

Sir help me content acha hai but marketing ki jrurt hai 😭😭😭🙏🙏please marketing kr do mere channel ki.....

[@dr.naveenkumarms7109]

There are many mistakes

[@santoshkumaruppada9498]

what are they

[@sreyaghosh8689]

What are the mistakes pls tell them

[@shaikharifa05]

Too gud sir

[@pawanofficialmail1688]

thanks sir

[@prabhatmishra160]

Thank you sir

[@rupalikulkarni4577]

Very well explained