If this video has helped you out, I would appreciate it if you hit Like and Subscribe and if you are feeling extra grateful you could buy me a coffee via the super thanks button ☕
At 34:53 , wouldn't you put X = 2 into your calculator, since the Binomial CD function on the calculator calculates the probability of everything up to and including the specified X value? I plugged X = 2 into my calculator as opposed to your X = 3 and got 0.0355 rather than 0.107. I think you calculated P(X≤3), but instead should have calculated P(X
I calculated it manually. He gets it wrong a few times. Perhaps an annotation needs to be added for the mistakes otherwise valuable time will be wasted. I did it one by one on the calculator, checked the input three times. It is 0.0355. My exam board prohibits calculators with automatic probability functions.
Its very subtle, it's because the doctor claimed there was a DECREASE in the number of patients, so we worked out the probability of a decrease and showed it was greater than the significance level
37:50 i've done the whole calculator process and i got the same values for the lower tail but for the upper tail, my critical region was 17, since 16 = 0.8929 and 17 = 0.9645. did i miscalculate it somehow ? i was taught for the upper tail to look for 1 - SL (95% in this case) the rest of the table matches your work except those 2 and i don't know how i messed it up.
at 10:30 isntthe answer 91/198 becaus eyou can pick the senior first or the junior first so there is 2 ways to get both when picked at random so the answer must be x by 2
Wait that's the exact answer I got before he revealed the answer, I did it the way TL Maths taught, I really need to know which one is right and fast..
normal cd mode on calculator. lower bound is 85 and upper bound is a very big number I usually use 9x10^99 and standard deviation is sqrt(varience) so sqrt(45) and mean is 70. which gives 0.01267365942 which rounds to 0.0127
Hopefully I'm wrong but isn't there a mistake at 10:33 as there are two ways to get that probability; 35/100 * 65/99 and then also 65/100 and 35/99. Surely you would then add these two probabilities, that's the way I've been taught. Anyway this video has been super helpful tysm!
If this video has helped you out, I would appreciate it if you hit Like and Subscribe and if you are feeling extra grateful you could buy me a coffee via the super thanks button ☕
Don’t worry guys I’m lowering the grade boundaries for everyone
bro istg im struggling, ill be the one lowering them 😥
That makes three of us
@@hoob6916trust bro I’m up early and still lost I’m bricking it
me too !!!
We’re in this together
Thanks mate, wasn't taught stats properly and have mainly been revising for pure, hopefully ill at least get some right
Sorry to hear this, glad my video helped. Good luck for tomorrow, let me know how it goes!
I'll watch this after 4-5months in June/July after my AS exams.. hopefully this video will clear all my concepts of S1 ...
so i did come back and it sure was a great video to recap all the stuff i learnt in S1 (some of them were out of the syllabus tho)
does this the morning of exam, im cooked
Same
same lmao
2h before the exam....
Here here
This has really helped me before my exam tomorrow, a quick 45 minute revision, thank you great video
Glad it helped good luck tomorrow
what exam was there 4 months again
@@jqwert909 I think she is talking about a mock exam
the mechanics one was really helpful so thanks for doing this :)
No worries! Glad you liked it!
the real xlons !?!?
Thanks for this video, ur amazing!! Helped to refresh my memory
You are welcome! Glad you enjoyed 😊
legit one of the best revision methods is just going through your channel. Exams tomorrow for me, wish me luck guys
Glad you find it useful! Good luck with the exam, let me know how it goes
im. cooked
Nah you've got this! Let me know how it goes
Thank you, Good luck for tmr!
You are welcome, let me know how tomorrow goes!
At 34:53 , wouldn't you put X = 2 into your calculator, since the Binomial CD function on the calculator calculates the probability of everything up to and including the specified X value? I plugged X = 2 into my calculator as opposed to your X = 3 and got 0.0355 rather than 0.107. I think you calculated P(X≤3), but instead should have calculated P(X
No, you don't calculate x = 2. You calculate P(X≤2). I think he got mixed up with normal distribution because it doesn't matter if you have ≤ or
I calculated it manually. He gets it wrong a few times.
Perhaps an annotation needs to be added for the mistakes otherwise valuable time will be wasted. I did it one by one on the calculator, checked the input three times. It is 0.0355. My exam board prohibits calculators with automatic probability functions.
On the page at 37:35 , how did you know you had to work out those probabilities for the lower tail and upper tail? Like where did p(x17) come from?
i feel like i always mix up pd and cd - honestly terrified for tuesday
If in doubt use cd, it's rarely pd
@@DrJamesMaths thank you ! when are the instances to use pd ?
@@amirah3791 when you are trying to find the probability of a single value ie p(X=a), whereas cd is p(Xa)
I thought the helicopter was over our house 😂
34:10 How do you know if the found probability has to be greater than or less than to deduce whether or not to accept or reject the null hypothesis?
Compare it with the significance level. Keep in a mind a two tailed test means u half it
If you want to see how to do 27:31 on the calculator. Watch this video: ruclips.net/user/shortsfVXHWiKUhoc?feature=share
Got about two and a half weeks 🤞
pls may i ask why, at 35:53 we are not using P(X=3)? As I thought the question said there is only 3 person waited 10+mins. Thank you.
Its very subtle, it's because the doctor claimed there was a DECREASE in the number of patients, so we worked out the probability of a decrease and showed it was greater than the significance level
@@DrJamesMaths Oic, thank you!
Ur saving my maths grade thank you so much
You are welcome! Glad you found it useful
27:04 why is it 25 and not 6?
37:50 i've done the whole calculator process and i got the same values for the lower tail but for the upper tail, my critical region was 17, since 16 = 0.8929 and 17 = 0.9645. did i miscalculate it somehow ? i was taught for the upper tail to look for 1 - SL (95% in this case) the rest of the table matches your work except those 2 and i don't know how i messed it up.
Yeah great question! Common misconception, it is hinted at earlier in the video but you need to do 1-p(X
@@DrJamesMaths thank you so much ! i was so confused, this video has helped a lot 🤍 i’m awful at this section but this was super easy to follow
@@amirah3791 glad it helped! Good luck for next week!
Night before people, wya?
How did you do
at 10:30 isntthe answer 91/198 becaus eyou can pick the senior first or the junior first so there is 2 ways to get both when picked at random so the answer must be x by 2
Wait that's the exact answer I got before he revealed the answer, I did it the way TL Maths taught, I really need to know which one is right and fast..
there is an error at 33:35 , if youre testing p(x
I think it's a bad
does this include all of AS?
Yeah it does, I didn't go into as much detail with the AS topics though
@@DrJamesMaths same thing for the mechanics vid?
@@zwebb no the mechanics vid is a bit more inclusive for AS
10:42 could it not also be the other way round aswell? So a senior then a junior? (So we do (65/100) * (35/99) + 91/396?)
Yes using the "OR" rule doesn't matter which order you do it
sir your teaching is awesome and btw your voice is amazing , i suggest you give a try voicing in anime
Is a level statistics good to do for engineering???
do you know if there is a textbook for 9ST0 statistics because I can't find one
Hi Dr James, would it be possible to do a Statistics A-Level paper (9st0) walkthrough? Thank you!
I tell you what, if I get to 1000 subs by 16th of October, I will go through any paper of your choosing
@@DrJamesMaths did u achieve it?
@29.02, where do you get that value from
Sigma = Square root of (15^2/5)
Mew = 70
And use normal CD
Hi, is there anywhere I can get this booklet without the working out so I can test myself?
Unfortunately not, sorry
how did you get the values of -1.0364 and 1.6449? I use a CG50
use inverse normal
Area 0.15 and 0.95
SD 1
Mean 0
Cooked
Let me know how it goes
is this both as and a2?
Yes it is
thanks for the vid Dr, is there any chance you could upload the documents divided into more pages? really hard to print atm
Did u find a way to print ?
@@samilanjeganathan5248 I screenshotted each page on to a word document.
@@samilanjeganathan5248 nah, just watched video and made my own notes, which tbf is a good way to revise
if you google a level statistics notes you get the exact same notes hhahaha
@@hs96793
How did u get answer for 22:28
normal cd mode on calculator. lower bound is 85 and upper bound is a very big number I usually use 9x10^99 and standard deviation is sqrt(varience) so sqrt(45) and mean is 70. which gives 0.01267365942 which rounds to 0.0127
I think it should be 0.8973 as he’s included the 120 value when it should be 119 and below I think
yeeeesss thank you so much ♥♥♥ :)
You are welcome! Good luck with your exam
the real zingini52 !?!?
cookeed
Nah you've got this 💪 keep pushing
I'm cooked
is this for edexel or aqa maths?
It covers all basis, stats and Mechanics are pretty similar for applied maths
Edexcel
Hopefully I'm wrong but isn't there a mistake at 10:33 as there are two ways to get that probability; 35/100 * 65/99 and then also 65/100 and 35/99. Surely you would then add these two probabilities, that's the way I've been taught. Anyway this video has been super helpful tysm!
You are right! Silly mistake from me. Well spotted, good luck with your revision
It's just amazing
Superb 🎉
thanks !
You are welcome!
Thank you
You are welcome! Glad you enjoyed it
whats E(X)?
mean (n x p), the expected value in a discrete binomial distribution
i love u sm
I'm glad it helped!
🐐
Thanks! Enjoy the video and good luck with the exam
hey noah
Who is noah?
atleast try to sound interested mate
I'm not here to sound interested, I'm here to get you results
its stats come on, just revise it and be done
sounds like someone cant appreciate
@@akinatouge9763 maybe not