T/F

1.Correlation of 0.80 for two variables A and B implies that if A increases, there is a 80% chance that B will also increase.

2.Var(X+2)=Var(X2)

3.Parameters will always be unknown, therefore it should be inferred from data collected from a sample.

4.E(XY ) = E(X)E(Y )

5.Not rejecting the null hypothesis at 0.05 level of significance means not rejecting thenull hypothesis at 0.01 level of significance.

Multiple Choice

6.If X is a discrete random variable, then is equal to

a.P(X 1)

b.P(X =0)+P(X =1)

c.F(1)

d.F(1)F(0)

7.A 65% confidence interval estimate for the difference of mean sacks of apple harvested offarmers Aand farmers Bfarmers A- farmers Bequal to (-9,500 sacks, - 8,500 sacks) shows that:

a.Farmers B harvest 9,500 sacks more monthly than Farmers A on the average.

b.Farmers B tend to harvest lower monthly sacks than Farmers A on the average.

c.Farmers A tend to harvest lower monthly sacks than Farmers B on the average.

d.Farmers A and Farmers B harvest equal monthly sacks of apple on the average.