1. In a study of possible correlation between the height in cm (X) and the weight in kg (Y) of chimpanzees, a sample of 40 animals produces a correlation coefficient of r=0.813 and a regression line with equation Y=0.34X+19.5. What is the expected weight of a chimpanzee that is 157 cm tall? Round off final answer to 2 decimal places.

2.

Regression Model	R2	Standard Error
y=5+0.68x	0.68	2.56

In the table above, the correlation coefficient or slope, 0.68,indicates that __________.

a. 68% of the variation in y is accounted for by x

b. whenever the value of x is 0, the value of y is 0.68

c. on the average, the deviation of the estimated value from the actual value is 68%

d. for every unit of change in x, there is a corresponding change in yby 0.68

3.

Regression Model	R2	Standard Error
y=5+0.68x	0.68	2.56

In the table above, the value "5",indicates that __________.

a. 5% of the variation in y is accounted for by x

b. on the average, the deviation of the estimated value from the actual value is 5

c. for every unit of change in x, there is a corresponding change in yby 5

d. whenever the value of x is 0, the value of y is 5

4.

Which of the two models will give more accurate predictions?

Regression Model	R2	Standard Error
Model 1: y=0.25x	0.97	1.57
Model 1: y=5+1.3x	0.68	2.56

a. Model 1

b. Can either be Model 1 or Model 2

c. Model 2

d. It depends on the available data