Z- test

Рет қаралды 267,577

4 жыл бұрын

How to calculate Z value and the corresponding value? Also will understand how to interpret the result.
Note: Unlike in this example, the number of samples (for more accurate results by z-test) should be atleast 30.

Пікірлер: 179

@soumyasaxena5151 3 жыл бұрын

Thankyou sooo much. You have no idea how helpful it was. It's indeed the best video on z test. Simple, quick and to the point.

@malathi.27 2 жыл бұрын

Couldn't understand Chi and Z the in class, watched many videos but there's no clear explanation and here you explained everything in a very simple way in just few minutes. Thank you so much sir 🙏🙌❤️

@ajitraut3829 3 жыл бұрын

When sample size greater than or equal to 30 then we conduct Z test👍

@VectorsAcademy 3 жыл бұрын

Absolutely... otherwise the result isn't accurate... This is just for the sake of understanding...

@mshahzad6164 Жыл бұрын

@@VectorsAcademy yes u r right and thanks for clearing the concept but still take sample size 30 or more caz this exapmle will confuse students bt t and z test ...otherwise u should tell in ur video that it is only for understanding purpose

@hazrat_nawaz Жыл бұрын

No, t test is held when sample size is less than or equal to 30 but but but with unknown population parameters. Here S.D is given.

@respecteverytalent0k Жыл бұрын

Here sample is 25 lesser than 30 why we conducted z test ?

@TragicGFuel 9 ай бұрын

because we had population parameters, not sample ones! @@respecteverytalent0k

@RajputMpsingh 3 жыл бұрын

You explained it soo well that it cleared many things sir 🙏🏻

@nilagangbaka4184 3 жыл бұрын

Cannot explain how thankful i am. Thank you!!!

@saikongz 4 жыл бұрын

This is the best one for z-test to my knowledge

@ialimustafa Ай бұрын

The best explanation available on youtube, thank you sir!

@1life865 2 жыл бұрын

Today in 30 minutes i understood chi and z test .. thank you sir 😍

@dolly4347 2 жыл бұрын

All doubts cleared after watching this single video. Sir please make one on t Test

@premikaramvittal8807 4 жыл бұрын

Realy got the concept clearly..... Thankyou to the team

@rohanshinkre 3 жыл бұрын

Sir u are brilliant in the way u simplify stats . Thank u

@ravindrasemwal5243 3 жыл бұрын

Great sir.... very nice way to express. ......this comment is behalf of all the lecturers what you hav uploaded....

@maheshkumars2593 2 жыл бұрын

Thank you for explaining the concepts in very understanding and easy method. Kindly provide more videos on statistics especially for parametric and non parametric tools.

@albinakash1483 3 ай бұрын

Thankyou sir☺️..ur presentation is very simple , clear and crisp. I haven't found a person who explains this well. ❤

@anuragmukherjee1878 2 жыл бұрын

Great Explanation. Good Example taken for the case. Thanks.!

@bikramadityaghosh1450 3 жыл бұрын

Excellent video. Lucid application. Appreciate it.

@kannayaa9626 4 жыл бұрын

Awesome. Understood very easily simply short and sweet. Keep going.

@kunalrai4524 8 ай бұрын

Thanks a lot , really explained in a simple and clear manner

@rashidmalshamsi 3 жыл бұрын

Brilliantly explained and presented. Thank you

@sangeethasaga 2 жыл бұрын

Clear cut explanation...thank you so much!!

@sanika6916 Жыл бұрын

Thankyou sir. This is the best explainantion. It cleared all of my doubts.

@mtechtransportationenginee2931 2 жыл бұрын

Nice explanation, it took me some time to understand how you got 0.0823 from the table

@mehboobmg28 4 жыл бұрын

Best video for z-test on youtube

@samikshasharma5892 3 жыл бұрын

very well taught sir! thank you so much

@kavindersingh2469 4 жыл бұрын

Thank you for the quality information.

@vibhabandhu6175 Жыл бұрын

Thankyou for explaining in a clear manner

@naziya9967 2 жыл бұрын

Very clear explanation.all the best carry on same work.many users need such videos.with your example I understood concept very Well. Need some explanation about assumption about z test.but it's ok.

@pasankeragala2866 4 жыл бұрын

Short and sweet 🙌 thanks

@aparnamadhumohan 28 күн бұрын

Very clear explanation. Thankyou sir.

@zulikhakhan4540 9 ай бұрын

Awesome brilliantly explained

@vaibhavbhuskute9522 3 жыл бұрын

Very well explained...Thank you

@ankathilokesh4410 Жыл бұрын

excellent explanation sir 🙌🙌

@ishaqhussain3892 Жыл бұрын

Very nicely explained.

@governmentteacherpreparati347 3 жыл бұрын

Sir can you teach through SPSS. because your teaching method is excellent and easily understandable

@rahulpathak9649 Жыл бұрын

Excellent information sir thanks

@sanaqureshi6533 4 жыл бұрын

Excellent explanation

@jpaiims Жыл бұрын

Superb explanation.

@saurabhmishra3394 2 жыл бұрын

Amazing explanation

@__AmanSingh-wt1ic 3 жыл бұрын

Nice explanation sir

@ameliacarter2692 3 жыл бұрын

thanks sir... this helped a lot

@idealmathsdeosir9308 2 жыл бұрын

explanation is very nice SIR

@funnyclub2764 3 жыл бұрын

As always Amzing video Sir. Thank you so much for this act of kindness. Keep It Up!

@VectorsAcademy 3 жыл бұрын

Your comments...😍

@pureplantation 3 жыл бұрын

amazing lecture

@rafiarehan4632 2 жыл бұрын

Jazak Allah Khair 🌸

@Vivek-xm2wx 2 ай бұрын

thank you sir clear explanation

@aquarius-zabir983 2 жыл бұрын

Thank you so much sir ❤️

@harishkumar5002 3 жыл бұрын

Sir, we have take level of significance 0.05 in the illustration, then why you are considering the p value at 0.09 (10%). Please clarify.

@meetalipalekar3168 2 жыл бұрын

Same question

@priyankakalita8102 2 жыл бұрын

it is because of the value -1.39, notice the z written in the corner of the table, they take -1.3 and 0.09, basically divided the value of z = -1.39 into -1.3 and 0.09 and then they got the value of 0.0823.....please correct me if i am wrong

@kunikakhobragade6953 2 жыл бұрын

Very well teached

@anjushacdas 2 жыл бұрын

Well explained sir

@ranaadnan8626 4 жыл бұрын

Excellent 👍

@meow__lalizabeth 3 жыл бұрын

Great video but N

@ravindrasemwal5243 3 жыл бұрын

If we have standard deviation then might be..... Its good question from you

@funshow4697 11 ай бұрын

Excellent 🎉

@karanmalpani4149 Жыл бұрын

sir wwhat about t test

@kondurusrikanth7620 3 жыл бұрын

nice explaination

@madhupal7071 3 жыл бұрын

Alpha=5% rejection level will be at both side i.e, 2.5% isn't it?

@Homeopath_canada 3 жыл бұрын

u are correct but when u write 5% without percentage sign ,it becomes 0.05

@robertstryker2 3 жыл бұрын

Nope, that's a one-tailed test, all we want to know is if their weight is significantly lower than the average. You're thinking about a two-tailed test, where the value tested can't be neither higher or lower

@terryterry3733 3 жыл бұрын

super explanation sir can u pls also make the video on ROC and AUC

@VectorsAcademy 3 жыл бұрын

Surely will try to make one

@manishmotwaniwyadgplzle2379 4 жыл бұрын

Pls upload the mathematical derivation too!

@izakventer9454 2 жыл бұрын

Thank you kind sir

@theomitchell416 6 ай бұрын

Thank you.

@__AmanSingh-wt1ic 3 жыл бұрын

1 video for t test please sir

@akshaysingh7962 8 ай бұрын

This was a nice video sir. I liked the practicality of your example and the steps involved. I did not understand how did we decide it will be 1 tailed test and not 2 tailed. Also if it would have been a 2 tailed test, what difference would it cause in our rejection region? Would love to hear your response. Thanks.

@VectorsAcademy 8 ай бұрын

If we need to find people above poverty... It's one tailed... But in the same graph if we need to find middle class, we need to remove lower class as well as higher class... (It's 2 tailed)

@sharonchetia54 4 жыл бұрын

Good video. Though Correction: n here is number of elements in the sample i.e. sample size not number of samples.

@DgfRhgy-nz7fk Ай бұрын

Excellent

@RMS2701 3 жыл бұрын

great sir

@saiyedsaniyazehra6270 Ай бұрын

Thank you sir

@brijesh0808 3 жыл бұрын

We never accept the Null Hypothesise. Either reject it OR Fail to reject it. :)

@prachigoel4541 2 жыл бұрын

Please explain the properties and applications of z and t test ?

@Namjooning_24 3 жыл бұрын

Thankyou Sir

@PrabhjotKaur-vl5rb 3 жыл бұрын

In normal distribution the bell never touches the lines

@navnithrajsn1705 2 жыл бұрын

95% CI to be considered, and both the side we need to consider 2.5%. Request you to correct the same or please clarify why u have taken 90% CI

@VectorsAcademy 2 жыл бұрын

You are right.. It should be 2.5 on both sides... In fact if you read the research question.. It should be one tailed test.. 5% on one side... The graph should just be used understand the meaning of significance level... Sorry for trouble

@DeepakAdhikari-mv8wy Жыл бұрын

Sample size is less than 30 in this case, should we consider z test based on sample size?

@praweshthapa4328 2 жыл бұрын

Why we check the value in 0.09 how to know where to check?

@abuda7em20 Жыл бұрын

why we used Z-Test intead of One Sample T-Test since our sample size is less than 30 observations?

@madhupal7071 3 жыл бұрын

To perform z test sample size should be greater than or equal to 30

@VectorsAcademy 3 жыл бұрын

Yes.. both the queries are correct... Firstly this should be a one tailed test by looking at our aim... Secondly more the sample size, more accurate will be the results... (for research purposes its important, for study purposes it's fine)

@Ujjayanroy 7 ай бұрын

one tailed test...you have to take 0.025 to compare with P value...for two tailed you can compare with 0.05

@KathirNatarajan-wk3nc 7 ай бұрын

Could u explain assumption of parameter test what condition must need to conduct parameter test?

@gurungnirmal 3 жыл бұрын

I think rejection level on both sides sud have. 025 value n mid point of the curve sud have. 95. Please correct me if m wrong. Thank you

@VectorsAcademy 3 жыл бұрын

Yes.. And actually in this example.. It should be a one tailed test...

@veeramania9381 Жыл бұрын

Bro end statement is accepted as the null hypothesis but in analysis fact observed Z- value is >Z-expected value in table. So the Null hypothesis rejected this problem.

@theomitchell416 6 ай бұрын

How do you do it differently if it's a 1-tailed vs 2-tailed test?

@Blink_dara 4 ай бұрын

Greater than-one tailed(right) Less than-one tailed(left) Equal-two-tailed

@jillashravya6574 2 жыл бұрын

Here . The sample size is less than 30 kadha..so.. how can we take this as a large sample test and z test

@kdasurrenderedsoul7613 6 ай бұрын

Hare Krishna 😊

@priyankakalita8102 2 жыл бұрын

please put a video on t test

@curiosityxxx4305 Жыл бұрын

perfect perfect perfect

@treasuretitus1205 2 жыл бұрын

What is the difference between z test and student's t-test?

@emreselek5836 Жыл бұрын

nice video but you said "accept the null hypothesis". shouldn't it be "cannot reject the null hypothesis" ?

@brins6 4 жыл бұрын

Pls do a video on Normal and Poisson distribution

@VectorsAcademy 4 жыл бұрын

Ok.. Will try at the earliest

@nilagangbaka4184 3 жыл бұрын

Wait can i ask what to do if the zed value has three digits after the decimal point? I am lost🧍

@VectorsAcademy 3 жыл бұрын

That shouldn't be a problem... If you still find a problem dealing with it.. just consider 2 digits after decimal.. ignore other values..

@nilagangbaka4184 3 жыл бұрын

@@VectorsAcademy THANK YOU SO MUCH💓💓💓💓

@avi.singh. 2 жыл бұрын

2:24 square or underoot?

@ayeshaejaz7740 2 жыл бұрын

Sir t test ko bhi explain krein or Yeh btaein ky kaise Pata chaly ga knsa test use krna hy

@hemant4495 4 жыл бұрын

X>30 z-test or not?

@aartipalande6588 4 жыл бұрын

Here we were supposed to perform a one-tailed z test right??

@VectorsAcademy 4 жыл бұрын

Yes.. well spotted...thank you...

@abhishekchakrabarty2930 3 жыл бұрын

Since the sample size is less than 30,will the z test work?

@VectorsAcademy 3 жыл бұрын

Z test will give highly reliable results only if sample size is greater than 30... For study purpose we can use it for less than 30 but not for research.

@duaahmed7685 3 жыл бұрын

Yes

@muskanmalik8570 4 жыл бұрын

Sir here sample size is 25 so how we can apply z test ??? Z test is applied where sample size is more than 30

@VectorsAcademy 4 жыл бұрын

Nicely spotted... You are the first one to do it... 😊 And thank you. You are absolutely right... I just took a random example to show how the Ztest is applied.. Didn't took the note of no. of samples... Practically it shouldn't be applied for smaller sample as it MIGHT lead to incorrect results...

@jumaniqbal8206 4 жыл бұрын

@@VectorsAcademy if the sample size is 30 or more,we can use z test.also,if the sample size is less than 30 and Standard deviation is known,then also we can use z test.