My thread of questions

[kamil9876]

no it shouldn't.

[ngRISING]

Essentials Text Book. !
CH 17A . Q4c) ii].

Quesiton is . f(x) = [1/5√2pie]e^[(1/2)((x+4)/5)^2]

Find E(X^2) .

[/0]

Do you mean ?

Then

However your calculator will probably have a hard time integrating this.

Instead note that the normal distribution is

So we have and

So now we can say:

[TrueTears]

Or just use the NormalCDF if this was MC Q.

[ngRISING]

THANK YOU TO YOU BOTH ^_^. got a tad confused there. .

[/0]

Or just use the NormalCDF if this was MC Q.

How would you use normCDF?

[Gloamglozer]

Or just use the NormalCDF if this was MC Q.

How would you use normCDF?

When it is a normal distribution and you need to add in a range of values.

EDIT:  Actually, come to think of it, we never use normpdf, do we?  So aren't we supposed to use normcdf if it a normal distribution?

[/0]

Or just use the NormalCDF if this was MC Q.

How would you use normCDF?

When it is a normal distribution and you need to add in a range of values.

Yes but can you find expected values somehow?

[TrueTears]

Or just use the NormalCDF if this was MC Q.

How would you use normCDF?

When it is a normal distribution and you need to add in a range of values.

EDIT:  Actually, come to think of it, we never use normpdf, do we?  So aren't we supposed to use normcdf if it a normal distribution?

Yeah normPDF gives the height of the density function. CDF gives the probability.

[Gloamglozer]

Or just use the NormalCDF if this was MC Q.

How would you use normCDF?

When it is a normal distribution and you need to add in a range of values.

EDIT:  Actually, come to think of it, we never use normpdf, do we?  So aren't we supposed to use normcdf if it a normal distribution?

Yeah normPDF gives the height of the density function. CDF gives the probability.

When do we need to find the height of a density function?  That's just the mode, right?

[TrueTears]

Or just use the NormalCDF if this was MC Q.

How would you use normCDF?

When it is a normal distribution and you need to add in a range of values.

EDIT:  Actually, come to think of it, we never use normpdf, do we?  So aren't we supposed to use normcdf if it a normal distribution?

Yeah normPDF gives the height of the density function. CDF gives the probability.

When do we need to find the height of a density function?  That's just the mode, right?

Yeah the mode is the X value that produces the height, not the actual height. Remember that XD

[Gloamglozer]

Thanks TT.  You gun. 

[khalil]

How do you derive f(g(x^2)), using the simplest method?

[TrueTears]

[khalil]

Which rules did you use?
I can do it but I have to use the chain rule twice, first to derive g(x^2) then the whole thing