I don't understand why other videos on youtube don't explain every term they use even when they are labeled as "beginner" or "non-technical". You are a great teacher and I want to thank you for giving me such a clear understanding of this in barely 7 minutes.
I have a statistics paper this monday I couldn’t understand wat my lecturer had taught at all but thank God I got this channel…hoping to get it right in the paper thanks so muvh
Where the heck have you been in my life? I literally will have the final test 6 days left, and you showed up just in time and taught me more than anything my lecturer tried to say in 15 weeks :< Sometimes, I hate the wrong timing in the right situation like this. 😕
Why are we still using the t table on the second example if the n is greater than 30 and the standard deviation is known ? ... Thank you, sir you made using the t table easy and understandable
Thank you very much for these amazing videos. I also have a related question to this material. let's say I have the following test observations for life spans of a machine (292,773 - 236,499 - 189,796 - 209,782), what is value ( which ensures that there is a 95% possibility of survival (reliability)) with 95% confidence? and how to calculate it? Again thank you very much in advance.
His question was my question too. So for the second example you used, if someone used the z-table since the sample size was large, he should get the same answer as you received for that problem?@@joshemman
@@laulau4367 For large sample, the answer will be close for both t and z but not exactly the same. Some courses use z for large samples and some don't.
I will suggest you follow what your course/textbook says. Some use Z when σ is known. Others use Z whenever n ≥ 30. Some use t when σ is unknown. Others use t whenever n < 30.
Some say use Z when n ≥ 30 and some say use Z when σ is known. I will suggest you check your notes, textbook, or with your prof to determine which approach applies in your course.
@@joshemman what does this sigma mean in our notes this is written which you wrote that sigma but I don't know what is it can your explain me? Thank you.
If the population standard deviation is unknown (sample SD is known), use the approach here. If both the sample SD and population SD are unknown, you can’t construct a confidence interval unless you have the standard error or the margin of interval.
@@joshemmanif i could rephrase, there are a few questions i’ve seen where one tail (a) is used instead of (a/2) such as a below or above average comparison. Could you explain when that is used?
@@exemplarypersonality6562 Some books use Z when n ≥ 30 but some use Z only when population standard deviation is known. I will suggest you follow how it is taught in your course.
Your videos broke so many topics down for me to where I could easily understand! Saved me so much time on my homework. Thank you!
Thank you so much @alejandromosqueda724 for your kind gesture. Much appreciated.
I don't understand why other videos on youtube don't explain every term they use even when they are labeled as "beginner" or "non-technical". You are a great teacher and I want to thank you for giving me such a clear understanding of this in barely 7 minutes.
My pleasure, @BoBu. Thanks for dropping a note,.
Legend. Only video I've found that explains confidence intervals involving t-distributions and does it even better than my lecturers!!
Glad you found it helpful! 🙏
@@joshemman Very much so i think i owe passing my exam to you sir
I have a statistics paper this monday
I couldn’t understand wat my lecturer had taught at all but thank God I got this channel…hoping to get it right in the paper thanks so muvh
All the best on your paper, Rhoda.
it seems so simple retrospect. I don't know how I had so much trouble with it. Thanks for the help!
The excel formulas you suggested in both videos are priceless.
Glad to hear, Ignatius.
Soothing voice with, to the point conceptualization makes life easy.
Thank you so much
agree
Thank you, this is a clear explanation of the topic. Very helpful and great job!
Thank you so much. My lecturers cannot explain anything.
Yes. Teachers are the worst people in the world
Seriously they don't
best stats yt channel fr
Thank you so much, this video cleared up all confusion i had regarding this topic. You are an excellent teacher!! Keep it up.
you are awesome buddy
thanks for the videos
i cant understand a thing my professor teaches!
Where the heck have you been in my life? I literally will have the final test 6 days left, and you showed up just in time and taught me more than anything my lecturer tried to say in 15 weeks :<
Sometimes, I hate the wrong timing in the right situation like this. 😕
me too man me too
i scored 8 marks in a 35 marks test lmfao i really was sucking at stats until i found this channel
Thank you very much! I have an exam tomorrow and your videos are so easy to understand. Great teacher!
Realy you are the great lecturer thanks alot.
Thank you so much you are a savior 🙏🏻
this channel i give me best tutorial for understanding statistic... thank a lot.. GBU
🙏
You literally saved me.
Thanks man 🙃
Wonderful... thanks a lot. I totally understand it now😊
You're welcome 😊
Thanks a lot ❤
You are great sir ❤❤❤
soo amazingly perfect way of teaching
Wish I had a teacher like this in uni
us
awesome. excellent clarity
Thanks, Chinyere.
😅you are saving lives out here
Thanks, can you shade more light on the aspect of t-distribution verse F-distribution while tagging +-30 sample mean.
Why are we still using the t table on the second example if the n is greater than 30 and the standard deviation is known ? ...
Thank you, sir you made using the t table easy and understandable
Some courses use Z when n > 30, but not everyone does. Some use t whenever σ is unknown irrespective of the size of n.
Great sir...
Its very helpful
We got it easily❤
Great 👍 Thanks.
so so good
This is what l’m looking for , thank you very much ♥️
You’re welcome 😊
thank you so much
Thank you very much for these amazing videos. I also have a related question to this material. let's say I have the following test observations for life spans of a machine (292,773 - 236,499 - 189,796 - 209,782), what is value ( which ensures that there is a 95% possibility of survival (reliability)) with 95% confidence? and how to calculate it? Again thank you very much in advance.
Thank you so much again, sir
Thank you so much sir
It's really helpful
life made easy!!
But we got two critical vakues one is positive and one is negative, but why only considered positive.
WOw, Thank you.
So, regardless sample size, in the event only sample mean is known(and sd sample) we use t-table all the way?
You have to check with your course. Some people use Z whenever the sample is large.
His question was my question too. So for the second example you used, if someone used the z-table since the sample size was large, he should get the same answer as you received for that problem?@@joshemman
@@laulau4367 For large sample, the answer will be close for both t and z but not exactly the same. Some courses use z for large samples and some don't.
Thank you!@@joshemman
Hii, so when do we use the t distribution and when do we use the z distribution??
I will suggest you follow what your course/textbook says.
Some use Z when σ is known. Others use Z whenever n ≥ 30.
Some use t when σ is unknown. Others use t whenever n < 30.
Thank you!
You're welcome!
how i ll understand that i ll use t table or z table :?
Some say use Z when n ≥ 30 and some say use Z when σ is known.
I will suggest you check your notes, textbook, or with your prof to determine which approach applies in your course.
@@joshemman what does this sigma mean in our notes this is written which you wrote that sigma but I don't know what is it can your explain me? Thank you.
@@trumpiden1098 Sigma is the population standard deviation. s is used to represent the sample standard deviation.
@@joshemman yeah but in questions how will I understand which one is it
@@trumpiden1098 If it does not say "population SD", then it is very llikely "sample SD".
what if the standard deviation is unknown?
If the population standard deviation is unknown (sample SD is known), use the approach here.
If both the sample SD and population SD are unknown, you can’t construct a confidence interval unless you have the standard error or the margin of interval.
Sir im still confused on when to use z ort score
You probably haven't watched enough videos. Keep learning. You'll figure it out.
I think, instead of trial and error, use a lower confidence level (
Great
Why have you used t distribution because n is 85 which is greater than 30 i thought it was suppose to be the z distribution
In some courses, they use Z because sigma is know. In other courses, they use Z because n is greater than 30. I'm assuming yours is the second case.
For t distribution the number should be lesss than 30 than in your last question n=85 how t distribution is applied... Plz explain i didn't get that
Yes, most people use t when n is less than 30. However, you can use it for any sample size.
When n is greater than 30 ain’t you supposed to use z table???
Some texts use Z when n > 30, and some don't. If your course says use Z, then do it.
Explain Why it is a TWO TAIL (0.025) and not One Tail (0.05). Much appreciated
By default a 95% confidence level is located in the middle of the distribution, leaving 0.05 area which is divided equally (.025) into the two tails.
@@joshemmanif i could rephrase, there are a few questions i’ve seen where one tail (a) is used instead of (a/2) such as a below or above average comparison. Could you explain when that is used?
@@JAG_158 See if this helps: ua-cam.com/video/Iv1RQnjV-1U/v-deo.html
ty
The margin of error is supposed to be 0.90369 multiply by 2.2140405
Where did you get 2.2140405 from?
If n> 30 then we use Z not t test !!
@@joshemmanis it true that we should use the Z distribution when n is larger than 30? I noticed you use t distribution on both cases
@@exemplarypersonality6562 Some books use Z when n ≥ 30 but some use Z only when population standard deviation is known. I will suggest you follow how it is taught in your course.
I have found a different margin of error different from yours
Ok
Teach me please
I'm trying 😆