Statistics Help

[luiz]

So the Math Paper 1 is tomorrow, and the only thing I don't know is the whole binomPDF, binomCDF, invnorm, normCDF, normPDF, etc (if there's any more like these...).

Does anyone have a good website which teaches you how to solve these?

[moniaa26]

So the Math Paper 1 is tomorrow, and the only thing I don't know is the whole binomPDF, binomCDF, invnorm, normCDF, normPDF, etc (if there's any more like these...).

Does anyone have a good website which teaches you how to solve these?

Actually, I don't know any sites that teach these kind of things, but I can help you with this.

So here it is:

you use :

- binom : when its a binominal distribution

- norm : when its a normal distribution

- pdf : if its p(x= something)

- cdf : when its p(x< something)

- invNorm : it gives you the data which is on the last page of the data booklet

FOR BINOMINAL DISTRIBUTION

Example:

X~B(n,p)

p(X=1) = binompdf (n,p,1)

Example 2:

X~B(n,p)

p(X>/3) = 1- p(X\<2) = 1- binomcdf (n,p,2)

FOR NORMAL DISTRIBUTION

Example1:

Z>x

P(Z>((x-u)/o)) = p(Z<((u-x)/o)) = p (Z<d) = normalcdf(lower bound, upper bound, u, o)

Example2:

if it asks you to find the value of k in:

p(X>k)=c

you do this:

p(Z> ((k-u)/o)=c

p(Z<((k-u)/o) = 1-c

((k-u)/o) = invNorm (1-c)

k= o x invNorm(1-c) + u

I copied my notes,

Hope this helps..

Good luck!

[moniaa26]

I also found this (attachement)

You can scroll down the document till the part where there is "Probability functions"..

biskehandout.pdf

[eoclevin]

Isn't Paper One without calculator? And Paper Two with calculator?

[luiz]

Thanks so much moniaa26! Helped me out

and yeah eoclevin, but I'd just like to understand 100% just in case they pull in some aspect of the whole statistics topic.

[soadquake981]

Yes, Paper 1 is without a calculator.

I'm assuming you're taking Math SL. If you're doing HL, you also need to know the calculator functions for Poisson.