1.Given the least squares regression line = 5 + 2x

a)the relationship between x and y is positive.

b)the relationship between x and y is negative.

c)as x decreases, y increases.

d)None of these choices.

1.If the coefficient of correlation is 0.9, the coefficient of determination is

a)is 0.6561

b)could be either + 0.81 or - 0.81

c)0.81

d)must be negative

1.Which measure of central location can be calculated when the data is nominal:

a)The mean.

b)The median.

c)The mode.

d)All of the above.