1 A multiple regression equation has a coefficient of determ

1. A multiple regression equation has a coefficient of determination of 0.81. Then, the percentage of the variation in y that is explained by the regression equation is 90%.

True/ False

2. The Spearman rank correlation coefficient can only take on values between:

a) -1 and +1;

b) - and 0;

c) 0 and +;

d) - and +1

3. When the relationship between two variables is very strong and decreasing in a linear way, the Spearman rank-correlation coefficient will be close to:

a) 0;

b) -1;

c) p;

d)

Solution

1) false

2) between -1 and 1

3)-1