STATISTICS PROBLEM!!!!

[supermagic]

i am very struggling wid "continuity correction" in s1
lyk... sometime u add 0.5 but sometimes u subtract 0.5 from the value...
it drives me carzy!!!! i dunno when to add and subtract valuess in different situation..
most mark scheme gives u both values, so i get one mark for it
but they carry out solution wid only one value!!!
so do i lose mark or it doesn't matter
(sry i am not an english, u might not undersatnd what i am trying to say hahahahah)
but if u understood me, plzz help me
S1 paper is NEXT WEEK !!!!!!!!

 

[hina]

therz a very simple logic to continuity correction. if:
P(X=n) =>P(n-0.5<X<n+0.5)
P(X>n)=>P(X>n+0.5)
P(X<N)=>P(X<n-0.5)
P(X<=n)=>P(X<n+0.5)
P(X>=n)=>P(X>n-0.5)

jus memorize nd apply!! thts wot i do!

 

[ahsanxr]

If you have the book "A Concise Course in A-Level Statistics" there is a page explaining the concept behind this. Read that and you'll understand what to do. If you don't, then memorize what hina said.

 

[ammadb]

look i have learned them this way
when its only > means greater than so add 0.5
when its only < means less than n so subtract 0.5
n when its greater or less than n equal to tou phir opposite hoga to above =)
that works fr me..

 

[sk8rdude]

look i have learned them this way
when its only > means greater than so add 0.5
when its only < means less than n so subtract 0.5
n when its greater or less than n equal to tou phir opposite hoga to above =)
that works fr me..

Aala..

 

[elixa]

hina i knw the rest but hw to do the first one-----P(X=n)??? do we hav such que in the paper??

 

[ammadb]

look i have learned them this way
when its only > means greater than so add 0.5
when its only < means less than n so subtract 0.5
n when its greater or less than n equal to tou phir opposite hoga to above =)
that works fr me..

Aala..

thanks

 

[ammadb]

@elixa .. well just take a range fr them
like if its X=10
take P(9.5<X<10)

 

[supermagic]

i did tons of dis kind of question....
but sometimes i got wrong.. even if i used the rule....
arghhhhhh(

 

[supermagic]

but anyway thx guys )

 

[elixa]

if (X=10) WONT IT BE..(9.5<X<10.5).....??????????

 

[weesha]

yeah its p(9.5<x<10.5)

 

[ammadb]

yep i frgot ..lol