Can someone please help me with this question httpwwwcheggco

Can someone please help me with this question? http://www.chegg.com/homework-help/state-whether-following-statements-true-false-uncertain-just-chapter-d-problem-4q-solution-9780073375847-exc

Solution

a)True ,parameters are fixed but they are unknown to us so by taking random sample we are trying to find the approximate value of parameter.

b)True because any estimater T is callled an unbiased estimator iff

    E(T) =Parameter

c)False , because we get minimum deviation on only mean so only unbiased estimator have minimum variance.

d)True ,because an efficient estimator has minimum variance