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2.

3.

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Solution

1. D

The estimator is a sampling random variable and the estimate is a number.

. a and b are estimate(sample avaerage and sample variance)

c and d are estimator

e is neither. (varaince of random variable z in population.)

2 B i.e to construct rejection rule...... when sample size n is sufficiently large.

3. Pr(Y <= 0)=

p(Y-6/3 <=1)= pr(z<=1)

=1-.158655

Pr(Y <= 0)==0.8413