14.A study reported a correlation of .5 for data relating cannabis use as the predictor variable to early death syndrome as the response variable. Interpret the coefficient of determination for these data:

a. An r of .5 leads to an r²of .25. This indicates cannabis use is responsible for early death.

b. An r of .5 leads to an r²of .25. This indicates cannabis use is responsible for one in four early deaths.

c. An r of .5 leads to an r²of .25. This indicates cannabis use explains 25% of the variance in early death.

d. An r of .5 leads to an r²of .25. This indicates cannabis use explains 75% of the variance in early death.

15.Given the equation of a regression line is = 2x - 5, what is the best predicted value for y given x = 10?

a. 48

b. 7

c. 25

d. 15

16.Given the equation of a regression line is = 3.5x + 11, what is the best predicted value for y given x = 4?

a. 48

b. 7

c. 25

d. 15