Hypothesis Testing: One-tailed t test for mean

Рет қаралды 165,020

Joshua Emmanuel

8 жыл бұрын

This tutorial shows how to conduct a one-tailed hypothesis t-test for a population mean.

Пікірлер: 100

@lagiordina4513 Жыл бұрын

i got an exam in 11 hours and this guy is a bloody genius. he makes it all so easy. thanks man, youre the best

@Anonymous-yb7qu Жыл бұрын

Are you writing the same exam as I am?😅

@wiws6834 Ай бұрын

A year later same situation

@stevenhughes7380 4 жыл бұрын

You are extremely good at explaining things in a way that makes sense! Thank you!

@TorosFilmz 2 жыл бұрын

I never get tired of learning statistics from your tutorials.❤

@sihamsebouai8070 Жыл бұрын

Your clear voice and easy explanation made me obsessed with this channel

@Quigglessish 5 жыл бұрын

you are an actual life safer Mr. Emmanuel. Great videos.

@ifargantech Жыл бұрын

I have an exam by tomorrow morning and you cleared up all my doubts. Thank you!

@savagearmy4972 2 ай бұрын

How Can I thank you enough? You deserve A LOT OF LOVE ❤️ RESPECT FROM MY HEART

@Da-tu4oq 3 жыл бұрын

I’m here before my exam and there’s only 12 hours left, thank that’s really help me

@orangegrass1 4 жыл бұрын

the best video to explain the t-test!

@felixlizwe1945 5 жыл бұрын

Amazing easy to understand lecture. Very informative...

@pixii5654 2 жыл бұрын

Thank you I was very confused one the one sided thing for when to reject it, but the visualization with the tails graph helps sooo much

@Thana1549h Жыл бұрын

Everything looks so easy when I watched this video. Thank you so oooooooooo much.

@lizaminasyan9255 3 жыл бұрын

U r the best❤️ I am so happy that I found ur channel

@kimberly3194 3 жыл бұрын

you are very very good thank u! my test is in 8 hrs I think I'll be saving me!

@CaribbeanMathGem 4 жыл бұрын

You're brilliant!

@albadi1 3 жыл бұрын

Thanks Mr your tutorial is clear.

@tsilavotahina 4 жыл бұрын

you deserve subscribe. I'd learn with book but with you ,it's shorter and clear😁👏

@ahmednaveed8256 Ай бұрын

i was very confused about this topic got a final exam in about 12 hours Finally it makes sense Thanks alot

@joshemman Ай бұрын

You're welcome. Hope your exam went well.

@aparna603 Жыл бұрын

Tysm sir for clearing the concepts

@joshemman Жыл бұрын

Always welcome

@dangkhoado7428 7 ай бұрын

thank you, this help me a lot

@LASTMINBOOST-xr7lb 2 ай бұрын

thank you sir, great explanation and presentation, very minute details are also explained well.

@joshemman Ай бұрын

So nice of you.

@josephmsimango6069 2 жыл бұрын

Thank You Chief

@jalilnazarli13 4 ай бұрын

thanks a lot for helping out!

@savagearmy4972 2 ай бұрын

HUGE HELP FOR ME

@mehuldeshpande2953 Жыл бұрын

Very well explained sir.Sincere thanks

@joshemman Жыл бұрын

Glad to hear, Mehul. Thanks,

@esthernyarko2335 2 жыл бұрын

Please with this example given,how I’m I to know that it is a left tailed test ?

@joshemman 2 жыл бұрын

The keyword here is "below". Left-tailed test have words like "less, decreased, ...." Regiht tailed tests have "above, more, increased,..."

@sinaabedini7487 4 жыл бұрын

Bless you

@ankushbhawal4428 5 жыл бұрын

Thank you so much

@arbogastkanyinga9422 2 жыл бұрын

shoutout to your videos, its that GOOD. too Good to be free

@mandeepbaluja5401 5 жыл бұрын

Love you bro

@tchekdenis-ki3lo Жыл бұрын

Thanks I get to solve my problems of maths statistics with your tutorial very easily. Please can you do for Kendall's rank correlations detailly.? I have problems there on how to get S

@nickterrencegantalao589 2 жыл бұрын

1:46 may I ask why the standard deviation isnt 4.8? its labeled 4.8 in the example problem but you substituted 4.6 for it

@joshemman 2 жыл бұрын

It was a typo; it should be 4.8. s = 4.8 was used to obtain -2.165 however.

@mmrida_ 10 сағат бұрын

thank you very much 💖💖💖

@joshemman 8 сағат бұрын

You're welcome.

@MuhammadYousaf-hq2zh 4 жыл бұрын

thankyou sir,

@wissalms2820 2 жыл бұрын

I have hypothesis test for mean20 , should I solve this problem like the way we solve mean=20 vs mean>20

@joshemman 2 жыл бұрын

Yes. It's the same way. We just write the null differently.

@umemashoaib4782 6 жыл бұрын

Lovely

@favouronwuchekwa 3 жыл бұрын

how did you get the 4.6 when the standard deviation was not given ?

@benhanock3641 6 ай бұрын

s represents standard deviation, which was given in the first sentence, it is 4.8 (he made a mistake saying its 4.6)

@clocktowerhill8760 5 жыл бұрын

Outstanding!

@PrinceAdom 2 ай бұрын

at 4:46, why are we using a sample standard deviation of 4.6 when 4.8 was given in the problem? using the original value of 4.8 gives a t -score of -2.259 which is greater than the t-score of -2.479, It still leads to failure to reject the null hypothesis anyway

@joshemman 2 ай бұрын

t is -2.165, using s=4.8.

@PrinceAdom 2 ай бұрын

@@joshemman thank you i guess a mistake then

@samkab677 4 жыл бұрын

how to write the Hypothesized Mean Difference as in example in excel solver ???? should it be zero ??? can it be other than zero in other cases?? if yes can you provide an example ???

@richardfader3021 2 ай бұрын

Standard deviation was 4.8 but on calculation you used 4.6, was it a mistake or there is a logic behind it?

@yenyenmainar4916 4 жыл бұрын

how do we know that is left tailed or right tailed?

@joshemman 4 жыл бұрын

Look for (right-tail) indicators like "increase", "more than", and "above". The left-tailed counterparts will be "decrease", "less-than", and "below".

@samirahaddaoui5522 Жыл бұрын

aren´t we supposed to use the Z- test as we have a known variance /Standard deviation? Normally we use the t-test when the variance is not given.

@joshemman Жыл бұрын

We use Z when we know the population SD. What we have here is sample SD.

@Kaylyn255 3 ай бұрын

2:23 you mixed up the standard deviation. Its 4.8 not 4.6. Other than that this video helped me a lot

@sayyadinthiyaz890 3 жыл бұрын

What is the z value

@shadyalfons9302 3 жыл бұрын

I have a Q sir Why don't we divide alpha on 2 in this example? 🤔

@joshemman 3 жыл бұрын

This is a one-tailed test so you do not need to divide alpha by 2. You only divide alpha by 2 in 2-tailed tests.

@shadyalfons9302 3 жыл бұрын

@@joshemman thanks sir you are the most talented genius teacher i have ever seen ❤️🌷

@joseignacionoarbesulayman915 4 жыл бұрын

eres la ostia

@Dist0001 3 жыл бұрын

Thank you for video. you help me more than paid professor. @John Trapasso if you see this SMH

@MrQaydi 6 жыл бұрын

It says the sample standard deviation is 4.8 but in the formula you wrote 4.6

@joshemman 6 жыл бұрын

You're right. It was a typo.

@maxmacfarlane9890 6 жыл бұрын

no worries Joshua! Very informative video. You've helped me so much.

@wakanakameza2011 Жыл бұрын

This is good but you said standard deviation is 4.6 or 4.8 how did you do it or it’s a mistake 😢

@joshemman Жыл бұрын

Yes, the 4.6 is a typo (at 1:44). It should be 4.8.

@vencintanthonygimoLPT 4 жыл бұрын

I wonder why the null hypothesis is greater than or equal to 24. What if I used Ho: u=24?

@joshemman 4 жыл бұрын

I will suggest you follow the convention used in your text/course.

@vencintanthonygimoLPT 4 жыл бұрын

@@joshemman thanks

@catpaul1680 4 жыл бұрын

I wonder why we don't set H0 as µ

@joshemman 4 жыл бұрын

Ho must contain equality.

@bintalshati Жыл бұрын

hi, how we know where is the claim ?

@joshemman Жыл бұрын

The claim is usually written somewhere as part of the problem statement. For example, if you’re testing if a prof states that the average score is less than 70, then the claim is that “the average score is less than 70%”

@hhykk 2 жыл бұрын

S and Theta are both for Standard deviation isnt? S is 4.8=Theta is 4.8 ?

@kashishsharma1826 2 ай бұрын

yea and they wrote the wrong value of standard deviation lol, they literally explained one question that too wrong

@hamzasenhaji4154 7 ай бұрын

normally is 4.8 / squar root 27 not 4.6 there is a mistake

@veranyambura3194 4 ай бұрын

I was looking for thuis comment A.

@hydershaikh83 7 жыл бұрын

last year 50% of MNM employees where female.it is believed there is a reduction in the percentage.random sample is 400, 180 where female.use 5% significant level.can u solve this one i am confused about N,S,X value what to take..i cant understand % sums

@joshemman 7 жыл бұрын

This is a proportion problem with p^=180/400. H0: p>=0.5 H1:p

@hydershaikh83 7 жыл бұрын

Joshua Emmanuel what will be the formula for this one.i have tomorrow stat exam and this sum conduct 10 marks so plz help me with the formula.Thanks a lot for replying.ur lectures are awesome.

@joshemman 7 жыл бұрын

Use the z formula for testing a population proportion.

@hydershaikh83 7 жыл бұрын

Joshua Emmanuel thanks again..

@MrQaydi 6 жыл бұрын

How do you solve this problem: H0 µ >= 3 H1 µ < 3 Sample size = 23762 Missing = 172 Sample mean = 3.14 Sample variance = 0.51 Sample std. dev. = 0.72 Sample std. err. = 0.00 T value = 676.55 This T value is calculated by a software. Is there enough evidence to reject the null hypothesis?