Hii all. Anyone plz clarify... are the proofs of moments (mean, variance) of various distributions required for examination?? I mean can these proofs are tested in exam CT3?? plz rply asap. Thankyou
If you know the general formlas for Mean and Variance in statistical terms and also good with calculus you can derive it on your own.You can also refer to Fundamental Of Statistics by Gungupta Dasgupta Vol-1.
hii .. can anyone provide the proofs of mean, variance of negative binomial distribution? I shall be thankful.
Check it out on this website: https://onlinecourses.science.psu.edu/stat414/node/79 Warm regards, Shyam
ya..thanku... it is ok if we find moments by using MGFs. But I am not able to find moments of some of distributions without using MGFs.. Is it sufficient if we use MGFs for finding moments in the exam?
I think that you can use it to find them out, but it would be better if you learned the proofs both with and without MGFs. Warm Regards, Shyam
The whole point of MGFs is to make finding the means and variances of distributions easier. Why would we not use them? In the IFoA exams do test first principles means and variances but of simple non-standard distributions.
