Hypothesis Test - Mean | μ | p value | z-table + Examples

How to conduct hypothesis test for a population mean μ using p-value approach assuming the population standard deviation (sigma) is known.

00:00 – Introduction
00:30 – Left-tailed test
01:22 – P-value
03:53 – 2-tailed test
04:50 – Right-tailed test
05:50 - Two-Tailed test

[tanyaabushaban]

Perfectly explained. Through all my stats classes I've just been plugging in the numbers, unable to visualize it, so I always forget. No one has ever been able to explain it this well. Thank you

[abiofficial-wspn]

Yes, this guy made it so easy !! I teach stats for junior college, and this guy just increased my already-existing impostor syndrome lol

[frankgama]

I don' know why this video is not getting more likes

[greatdani]

I love your videos and your way of explaining is really good i would like to request you one thing how many Z-table we have to see z scores? because i got confuse can u please make a video on that? thanks alot for your videos

[mashuur]

Thanks, Joshua. This is a great video

[davidishola]

Please im confused. Why did you minus 1 from the value you get from the table in the right tail test but didn't do so in the left tail test?

[cheldeeclairetubog]

Hi joshua, why did you use pvalue 0.0344 in your last example when it is a 2-TAILED test ? I thought you only subtract 1 from the value in the table when it is right tailed test?

[abiofficial-wspn]

[Edited] I do have a question. Do we have to multiply p-value with 2, for 2-tailed tests? I'm having a hard time wrapping my head around this.

[cococnk]

Morning sir, thanks for the lecture.

My question is on what base, do we attribute a level of significance ("LS") to a hypothetical question?

For instance for a sample we do a hypothesis testing for this two: "LS" = 0.01 and another at "LS" = 0.05

We can have the following results:

for a "LS" = 0.01 we fail to reject the null hypothesis, for a "LS"= 0.05 we do reject the null hypothesis...

So it can lead to an error in conclusion of the experiment?

So how do we choose our "level of significance "?


Thanks.

[noelawaseth]

Hi Joshua, I'm confused about your last example, why have you subtracted minus one in the 2 tailed test when the claim does not suggest a right-tailed test?

[ressyeldyana]

if only I had seen this good lecture before hmm. but it's too late i have to face the exam in 30 mins from now.

[Arun-qusf]

hey Emmanuel in two tail test you are testing for differ from mean @ signi level .05 means it will be rejected only if value = .05
but you are rejecting it when value < .05 why?

[nutritionistzainab]

Thanky so much bro 💫💫💫all queries solved

[desmondenyia]

I thought the alpha has to be divided by 2 when working with the 2 tailed hypothesis?

[princeisabel]

How did you get the 4.9 from the alpha of 0.01

[chantellechikukwa]

How're you Mr Joshua, where can we get your email address?