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Calculating the bias watch

1. A random sample (X1, X2, X3...Xn) is taken from a population of unknown mean and variance

I have to find the bias of where

The bias is = E- , right?
So I have: -

But I'm not really sure what to do after that? I have to find the variance and mse as well after but need the bias first...

Any help appreciated, my stats lecturer is terrible and I've never done this topic before

cheers!
2. (Original post by narc)
The bias is = E- , right?
No, it's E(mu*) - mu.

So I have: -
Well, the hard part is working out right? So why don't you think about what the sum of X_i is?

surely?

So you need to work out
3. (Original post by Swayum)
No, it's E(mu*) - mu.

Well, the hard part is working out right? So why don't you think about what the sum of X_i is?

surely?

So you need to work out
Hmm, do I assume that because the sample is random?
4. I have no clue to be honest.
5. Ah. Well...thank you anyway

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