1. A result is called "statistically significant' whenever. (4 pts) a. The null hypothesis is true. b. The significant level a = 0.05. c. The p-value 20.05. d. The p-value is less than the significant level. 2. Null and alternative hypothesis can be statement about which of the following? (4 pts) a. sample statistics. b. sample estimates. c. population parameters. d. something else. 3. Which of the following indicates the strongest relationship? (4 pts) a. r = 0.90. b. r = 0.10. c. r=-0.95. d. r = 0.55. 4. A 95% confidence interval for the average salary of all CEO in the electronic industry was constructed using the results of a random survey of 45 CEOs. The interval was ($139,048, $154,144). Given a practical interpretation of the interval. (4 pts) a. We are 95% confident that the mean salary of all CEOs in the electronic industry falls in the interval $139,048 to $154,144. b. 95% of all CEOs in the electronic industry have salaries that fall between $139,048 and $154,144. c. 95% of the sampled CEOs have salaries that fell in the interval $139,048 to $154,144. d. We are 95% confident that the mean salary of the sampled CEOs falls in the interval $139,048 to $154,144. 5. For the regression model Y=10.2-5 X, when Xincreases by 10 units, then (4 pts) a. Y increases by 5. b. Y decreases by 15.2. c. Y increases by 15.2. d. Y decreases by 50.