Q&A Bank 3.3(ii)

[mcallist]

Hi,
The answer here says that since E(x) = 0.5, we can't use the first moments. Could someone please explain why?

Thanks,
Tom

 

[mcallist]

Also, if someone could please explain how we get 1/4(2a + 1) + 1/4 from subbing the two alpha parameters into the eq.
Thanks

 

[Bharti Singla]

Hi,
The answer here says that since E(x) = 0.5, we can't use the first moments. Could someone please explain why?

Thanks,
Tom

E(x)= 1/2 is constant here, since it doesn't involve alpha, we can't solve the value of alpha by equating it with sample mean.

 

[Bharti Singla]

Also, if someone could please explain how we get 1/4(2a + 1) + 1/4 from subbing the two alpha parameters into the eq.
Thanks

We can do it like this...

 

[mcallist]

Thanks a lot Bharti. Sorry for late response