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

2. Which of the following variables is continuous?

3. 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

4. What percentage of the area under the standard normal curve is between z = –1 and z = 2?

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

6. 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

7. A committee of 3 people can be selected from 12 people in how many different ways?

8. 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.)

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. A 100-question multiple-choice test has four alternative responses for each question. If a person picks one of the responses for each question at random - what is the person’s expected score?

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

13. A box contains 3 balls numbered 1 - 1 - and 7 - respectively. A ball is drawn at random - its number is noted - and it is put back in the box. This process is performed 100 times. Which of the following is expected to be closest to the sum of the 100 numbers noted?

14. If a person invests $1000 at 10% and $3000 at 30% - the average return of the total investment is

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

16. 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?

17. 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?

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

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