help thanks!

1. In a two-sided t-test with df = 20, the value t = = -1.85 is statistically significant at the following level of significance: A. 1% B. 5% C. 10% D. none of the above 2. Which of the following statements about the coefficient of determination r2 is NOT true. r2 is: A. always a number between 0 and 1. B. likely to decrease when new explanatory variables are introduced in the model. C. equal to the square of the correlation coefficient r. D. equal to the proportion of explained variation in the response variable. 3. Which regression model would be most appropriate for modeling the relationship between x and y shown in the graph to the right? O A. y = at Bx+ & B. y = a + Blog (x) + & C. log (y) = a + Blog (x) + D. log (y) = a + Bx+ 1000 2000 3000 4000 5000 O O 0 1000 2000 3000 4000 5000 6000