consider the unbias estimaters mu1hat = 1/2 xbar + 1/2 ybar. and mu2hates = 1/3 xbar + 2/3 ybar. calculate the variance of mu1hat and mu2hats

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- Apr 7th 2011, 02:09 AMCaption12unbias estimates and variance?
consider the unbias estimaters mu1hat = 1/2 xbar + 1/2 ybar. and mu2hates = 1/3 xbar + 2/3 ybar. calculate the variance of mu1hat and mu2hats

- Apr 7th 2011, 10:05 AMSpringFan25
can you work out ?

if so, you can use:

which will give you and hence

repeat the process to get

Finally, you can use:

to get the variance of the sum. - Apr 7th 2011, 11:38 PMmatheagle
I would like to know a lot more information,

such as the sample sizes, the covariance between the X's and Y's

the variance of X and also of Y

AND I guess, both the expected value of the X and Y is this mythical Moo. - Apr 9th 2011, 12:19 PMCaption12

i have never herd this one it is nt in my sylabus

covarance is also not in my sylabus and i dont know any resource i cn find to find this one out.. i looked on many website and i not find ...

also there is not muhat 1 and muhat 2. .. it is muonehat and mutwo hats. like U '', - Apr 9th 2011, 12:44 PMCaption12
- Apr 9th 2011, 03:18 PMmatheagle