Hypothesis Testing - Z test & T test

In this video we solve some hypothesis testing problems using both the z test and t test. It involves one-tail and two-tail tests.

We look at when to use the z test and when to use the t test. We then apply our learning to some exercises. They involve stating the null and alternative hypothesis, calculating the critical value, calculating the z/t value and finally determining whether we reject or accept the null hypothesis.

0:00 When to use which test
01:00 Exercise 1
04:52 Exercise 1 - Critical Value
06:20 Rest of Exercise 1
08:36 Exercise 2
11:25 Exercise 2 - Critical Value
12:50 Rest of Exercise 2

[jewelminor]

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

[Shrutimmmmm]

for such a crisp n clear explanation!!!

[fabiolasilva]

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

[malvikapant]

crisp and clear. Thanks for the simplification

[akberali]

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 :)

[pmicozzi]

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

[kanakanakanakanameki]

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

[Star_Handler]

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

[matthew-ni]

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!

[sajanyerra]

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 <=2.45' ?

[haifaelhassan]

Great to-the-point explanation 🙂Many thanks

[joshuaguzman]

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

[joeycaunsag]

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

[Joxora]

Thank you sir.
Well expantiated and understood😊

[krasnerjessica]

im new to stats...did you mean to write u-1 instead of n-1 fkr the degrees of freedom, or am I confused

[chalseabito]

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

[mansaproduct]

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

[engelnkosi]

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

[bangtri]

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?

[echezonajasmine]

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