1. As a sample - five high school students were asked to record the number of hours they spent studying during a one-week period. The ranked data is: 0 - 1 - 2 - 3 - 3. Which of the following statements about the data is correct?

2. In a sample of 2000 drivers - 860 had their seat belts fastened. If one driver is chosen at random - the probability that the driver chosen was not using a seat belt is

3. Which of the following statements about the square of the correlation coefficient is true?

4. Assume A and B are mutually exclusive events. If P (A) = 0.2 and P (B) = 0.6 - then P(A or B) equals

5. Test scores of 1000 students were found to have a mean and a standard deviation of 500 and 100 - respectively. If the distribution of scores is bell-shaped - the number of scores that fall in the interval 400 to 600 is approximately

6. The aspect of a normal distribution curve that represents probability is the

7. When two sets of scores have symmetric distributions and the same means - which of the following must be true?

8. Suppose x and y represent the number of hours studied for a test and the score on the test for a sample of 30 students - respectively. If the method of least squares gives a = 24 and b = 4 in Å· = bx + a - what test score would be predicted for someone who studied for 3 hours?

9. How many different 4-digit sequences can be formed using the digits 0 - 1 - 2 - 3 - 4 - and 5 if repetition of digits is allowed?

10. Test scores of 1000 students were found to have a mean and a standard deviation of 500 and 100 - respectively. If the distribution of scores is bell-shaped - the number of scores that fall in the interval 400 to 600 is approximately

11. If a die is rolled twice - what is the probability that each roll comes up 3 or greater?

12. To ensure that there will be a 95% probability that the sample proportion is within 3% of the population proportion - the sample size n must be no less than

13. Joe has three extra concert tickets to share with his eight friends. The number of ways he can distribute the tickets is

14. Which of the following statements about the square of the correlation coefficient is true?

15. Joe has three extra concert tickets to share with his eight friends. The number of ways he can distribute the tickets is

16. To ensure that there will be a 95% probability that the sample proportion is within 3% of the population proportion - the sample size n must be no less than

17. A sample of 100 students at a university showed that 43 had completed one or more remedial college courses. A sample of 200 students at a junior college showed that 90 had completed one or more remedial college courses. Which of the following statements about the null hypothesis that there is no difference in proportion of students who complete remedial courses at a university or a junior college is true? (Assume α = 0.05.)

18. Which of the following variables is continuous?

19. When two sets of scores have symmetric distributions and the same means - which of the following must be true?