The Last Minute Statistics Livestream [Bicen Maths] Tues 18th June, 5pm-5.45pm
ฝัง
- เผยแพร่เมื่อ 17 มิ.ย. 2024
- If you'd like to access a 2 hour recording of a Zoom revision session for stats, plus an additional video going through some additional questions I set, you can purchase them here, and access all the materials immediately in the confirmation email (check your spam if it doesn't arrive!): buytickets.at/bicenmaths
We'll focus on the stats element of Paper 3 in readiness for Thursday's exam - see you there!
Here are the questions I'll be using: drive.google.com/file/d/14Vlr...
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Sir you and mr astbury have clutched up A-Level maths for us students this year, so thank you !
and the fact that i was just watching mr astbury hard alevel questions #60 😄😄
why are you impersonating a maths youtuber 😭
real zeeshan fan eh
Thank you Mr Biscen you helped me so much for my a level maths & further maths - I wish you all the best keep teaching as well as you do!
Thank you so much! Good luck! :)
we need a Bicen TotK letsplay.
thank you so much for this, and making up your own questions must have taken hard work really appreciate it
Such a nice thing to say - thank you! I have wanted to write my own questions for a while to become a better teacher - so I figured it was time to get started!
Thanks sir your the best, look forward to seeing you in the exam hall with us tomorrow, best of look to us all on the last maths exam!!!!
GOOD LUCK! Come say hi to me before we go in!
At 18:48 , when u create ur probability, are you basically just putting down the most extreme thing so it strengthens the hypotheiss
Yes exactly!
Hi sir, on question 2a) would a valid point be that there should be a fixed probabilty of winning and there should be two possible outcomes?
Thank you
Yes - I think fixed probability makes more sense in this context than the two outcomes one.
hi sir very last minute but for critical values is it the value that is under your significant level or the one closest to it because the solution bank says ‘closest to 0.025’ when’s it’s above 0.025 and not below it? i thought it was the one first below is your critical value?
It is below usually - but sometimes that might say find the value that is closest instead. Just read the Q carefully!
how do you know when carrying out a hypothesis test whether or not to include greater than or equal to or just greater than?
Binomial - include it
Normal - don't include it (it doesn't matter if you do though)
Do you have any idea why the grade boundries for an A* were significantly higher in 2023 than all the previos years? going from a range of 204-220 up to 244 is pretty crazy i think
2 things:
1) they needed to allocate fewer As and A*s than in 2022 to return to 'pre-pandemic' levels of those grades allocated - complicated to explain in detail, but we knew that grades would be up for that reason
2) the paper was much more accessible, meaning more people got higher marks, so grade boundaries jumped
For Q1.b. how did you know which mean to put as your mew i always get the two means swapped around?
If you put the wrong one, you'll get 0.5 as your probability, so you know it's wrong!
This is where labelling of the means are really important - it should be x bar - mu / sigma.
x bar is the mean of the sample
mu is the mean of the population (the thing we are testing to see is true or not!)
Hi I just wanted to ask for 3b why are we doing it more then 149.5 and do we need to do it every time for normal approximation?
it's called the continuity correction & we do it because we go from discrete data in a binomial distribution (i.e. there are only a certain number of values it could be, like 1 or 2 or 3 etc) to continuous data in a normal distribution (i.e. it could be any value). you need to do it every time you approximate from binomial to normal
yh its called continuity correction cause when we go from binomial to normal we need to adjust the value they are given to us by .5 (usually minus 0.5)
At 22:35, you said not to worry about the equal sign but when i used P (X≥28) i got σ = 3.33 and then got P (X
I don't think there's a way you can put = for normal distribution on the calc, so I don't know what you mean here!
26:08 why do you put P (X>28) and not P (X≥28)? If it says at least 28 minutes does that mean not including 28?
It's a continuous distribution, so these actually mean the same thing. If they are discrete, then yes, they are different!
Q1b is similar idea to proof by contradiction i.e. assume null hypothesis is true if p value is less than sig level then contradicts hence reject null hypothesis
Yes! That's a great way of looking at it.
Hi Sir, do you not double the p value?? As I have seen to double this in a mark scheme
For Q1,b
Only for two tailed tests!
resitting is acc okay
do we get 2 separate papers on the day or is stats and mechanics one paper
I *think* it is 2 separate papers... but I am not 100% sure of this...
@@BicenMaths thank you, I appreciate the response
Why is the continuity correction for question 3 149.5 and not 150.5?
Because it was anything that is greater than 150, and 149.5 also rounds to 150!
Mr bicen +Mr astbury 🐐🐐🐐🐐🐐🐐
Hi sir, why would the P(C) + P(D) be greater than 1? (43:23)
Because we added them, and the numerator is bigger than the denominator. If the numerator is bigger than the denominator, then the fraction is > 1
@@BicenMaths oh that makes sense, thabk you very much!
“Who would play the mini game 30 times?”
My addiction to Sploosh Kaboom from Wind Waker would like a word…
Hoping for a Wind Waker remaster on Switch or Switch 2...
nia pfp spotted
@@asprinjuice8877a person of culture I see
For question 3c sir why no continuity correction
The last question? There was no normal approximation done, so no need to do continuity correction. You only do this for normal approximations!
At 22:44 Why would you reject H0 As the probablity to win is greater than 0.05. Hes won more games??
But that probability is higher than 5% when we assume that the probability is 0.3 still - in other words, when we assume that p=0.3, it's quite likely (more than 5%) that I won at least 20 games.
@@BicenMaths Ohhhhh Makes sense Thanks
28:41 i still dont understand why its 149.5 and not 150
Its continuity correction because you’re going from binomial to normal