hello i am just confused about the formula you are using to standardise the distribution, the one I am using is which X-M/standard deviation, i dont know why you wrote standard deviation/ squre root of sample size?
Sx divided by the square root of the sample size gives you the estimate for Sigma, or the population standard deviation. He had the sample standard deviation so he needed to use that formula
Very good job! What to do when the population mean is unknown? In real studies, it is normally hard to know the population mean. People can use literature data. However, how about there is no literature prior data?
Hi Lina, In reality, (as you correctly point out) it is impossible to calculate the probability of a Type 2 error as the population mean is unknown. What we can do is use hypothetical population means, and calculate the prob of Type 2 errors. So for example, "IF the population mean was 100, what is the prob of a Type 2 error? What is the population mean was 90 instead? 80? 70?". These values can then be compared with a competing test, and we can see which test has more power (less probability of commiting a Type 2 error). Hope this helps! David
@ 2:12 can someone please enlighten me. his first Ho used greater than or equal to. but upon rewriting it was already plain equals. why did he do this?
If that is the case then why did he write first the null hypothesis to be myu is greater than or equal to 60? why not write it immediately as myu equals 60? I'm still confused, thanks for the reply though!
I think it was just a way that's easier for people to see and understand. You know what your alternative is (mu < 60), so to figure out what your null is, you start it out as the opposite of your alternative (mu >= 60), then transfer it to equality. I'm not 100% sure why he chose to write it like that, though
+aopu345 Yup, you don't need the sample average when calculating the Type 2error. All you need are the true population mean and the hypothesised population mean.
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This is the clearest explanation I've found for this type of problem so far
Seeing this 15 minutes before my statistics exam. Now I want them to put a beta question on the test. Thanks for explaining it so clearly.
you boss... after a bunch of books, webpages, and a lot of guys I finally get it. thanks a lot. Regards from Mexico
Great video! How do you calculate P(type 2) for a chi-squared test or a linear regression t-test?
this is the best tutorial to follow…would give two thumbs up if I could
Your explanation is so much better than jbstatistics tryhard that over completely over complicated the problem
you saved my life thank you so much
I had to subscribe you broke down the information in layman. God bless you
Thank You. Can this same methodology be applied to trend test post hoc? without monte carlo simulations?
I might pass my statistics exam just because of you
Thank you so much from the bottom of my heart...
Very well done my friend. Thank you.
y did you take 0.12714 (which corresponds to 0.04 up the column)?
at 2:03 If Peter claimed that the average is less than 60 percent why did you set it to H1, not H0
Jiwon Kim yes why???😪
Hi Jiwon, H0 always contains the equal sign. Check out this video that may help: ruclips.net/video/R2hxisYFKxM/видео.html
Thank you for this, its indeed concise
But this was actually very helpful. Explained so much better than my Korean professors. 😒
I’ll just take the F. 🤷🏾♂️
omg the best one. upload more please
This is awesome! Thank you!
Finally understood. Thanks a lot
Does this mean the probability of a type 1 error is 0.12714 or 1-probability of type 2 error?
probability of a type 1 error is the significance level given
Its reli detailed!!!!! thanksssss
very helpful thank u so much
That was really helpful. Thanks so much
hello i am just confused about the formula you are using to standardise the distribution, the one I am using is which X-M/standard deviation, i dont know why you wrote standard deviation/ squre root of sample size?
Sx divided by the square root of the sample size gives you the estimate for Sigma, or the population standard deviation. He had the sample standard deviation so he needed to use that formula
Ciara TheTurtle alright thx already pass the exam!;)
Very good job! What to do when the population mean is unknown? In real studies, it is normally hard to know the population mean. People can use literature data. However, how about there is no literature prior data?
Hi Lina,
In reality, (as you correctly point out) it is impossible to calculate the probability of a Type 2 error as the population mean is unknown.
What we can do is use hypothetical population means, and calculate the prob of Type 2 errors. So for example, "IF the population mean was 100, what is the prob of a Type 2 error? What is the population mean was 90 instead? 80? 70?".
These values can then be compared with a competing test, and we can see which test has more power (less probability of commiting a Type 2 error).
Hope this helps!
David
+Quant Concepts thanks! It helps a lot! 👍
Super clear! Thanks
So is c the x bar?
Thank you very much for making me understand this
master! well explained it!
thank you ! very helpful
THANK YOU SO MUCH!!
That was great. Thanks for explaining so clearly!
this is very helpful!
BLESS YOUR SOUL
Thanks!
Thank you so much
very useful
Amazing.
thanks, mate
@ 2:12 can someone please enlighten me. his first Ho used greater than or equal to. but upon rewriting it was already plain equals. why did he do this?
Null hypotheses are always equality statements
If that is the case then why did he write first the null hypothesis to be myu is greater than or equal to 60? why not write it immediately as myu equals 60? I'm still confused, thanks for the reply though!
I think it was just a way that's easier for people to see and understand. You know what your alternative is (mu < 60), so to figure out what your null is, you start it out as the opposite of your alternative (mu >= 60), then transfer it to equality. I'm not 100% sure why he chose to write it like that, though
thank you so much. i agree with your explanation. 😁
you are a boss
thanks a lot :)
Thanks :)
Rly fkn helpful. thanks you
so u didnt had to use the sample average 57%?
+aopu345 Yup, you don't need the sample average when calculating the Type 2error. All you need are the true population mean and the hypothesised population mean.
Hello Sir , How to determine Z value ?? where do I get this Z value chart for see Z value of significance level?? Please help me
this is the important question you dont want to teach where do you get 0.12714
please replace my ap stats teacher
sexy British accent! very helpful
amber yang It's an Australian accent.
Type II error.
7:29 thats what she said