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Suppose   x+r    denotes  the sample mean  in a sample of  size  r, and                  &nbsp

Suppose   x+r    denotes  the sample mean  in a sample of  size  r, and

                           assume:

                                               x+r     ~   N( µ  =  350,   σ2 / r).

                             (i) If  r   <   s, what is the efficieny  of  x+r   relative to  x+s  ?

   (ii) Consider the pooled mean obtained by mixing  two samples of size  r

       and  size  s.  What is the efficiency of the pooled mean relative to  x+r ?

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