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September 20, 2014

September 20, 2014

Posted by **ruth** on Thursday, August 10, 2006 at 2:04am.

U = X1+X2+X3+X4;

V = (X2)^2+(X3)^2+(X4)^2+(X5)^2

and W = U/sqrtV.

(a) Name the distribution of U/4 and V/(variance) and give the values of their parameters.

(b) (i) Compute k such that kW has a t-distribution.

(ii) Give the number of degrees of freedom of this t-distribution.

(c) Compute E(V).

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