1. Which of the following is an example of a continuous variable? A. The number of males in each class offered by the college B. The gender of each student in a psychology class C. The amount of time to solve a problem D. The number of children in a family 2. What is the mean for the population of scores shown in the frequency distribution table? X f 5 2 4 1 3 3 2 2 1 2 A. 29/5 = 5.80 B. 15/10 = 1.50 C. 27/10 = 2.90 D. 15/5=3 3. A random sample of n = 9 scores is selected from a normal distribution with , =80 and =12. What is the probability that the sample mean will be between 76 and 847 A. 0.9974 B. 0.3830 C. 0.2586 D. 0.6826 4. What is the total number of scores for the distribution shown in the following table? X f 4 3 3 5 2 4 1 2 A.10 B. 4 C. 14 D. 37 5. What is the value of E(X-2) for the scores 2, 3, 5? A. 4 B. 8 C. 6 D. 10 6. In a correlational study A. 1 variable is measured and there is only 1 group of participants B. 2 variables are measured and there is only 1 group of participants C. 2 variables are measured and 2 groups are compared D. 1 variable is measured and two groups are compared 7. For a sample with S = 12, a score of X= 73 corresponds to z=-1.00. What is the sample mean? A. 79 B. 67 C. 61 D. 85 8. What is the shape of the distribution for the following set of data? X f 5 1 4 1 3 2 2 4 1 5 A. normal B. positively skewed C. negatively skewed D. symmetrical 9. Which set of scores has the smallest standard deviation? A. 5, 11, 42, 22 B. 27, 105, 10,80 C. 11, 17, 31,53 D. 145,143,45, 147 10. What proportion of a normal distribution is located between z= 0 and z= +1.50? A. 0.9332 B. 0.4332 C. 0.8664 D. 0.0668 11. What is the shape of the distribution for the following set of data? Scores: 1, 2, 3, 3, 4, 4, 4 5, 5, 5, 5, 6 A. positively skewed B. negatively skeyjed C. normal D. symmetrical 12. Which types of graphs are used for data from an interval scale? A. Histograms, bar graphs and polygons B. Histogram and bar graphs C. Polygons and bar graphs D. Histograms and Polygons 13. If a sample of n = 4 scores is obtained from a population with = 70 and = 12, what is the z-score corresponding to a sample mean of M= 73? A. 1.00 B. 0.50 C. 2.00 D. 0.25 14. A population has SS = 100 and ^2 = 4. What is the value of E(X- ) for the population? A. 25 B. 400 C. 100 D. O 15. A researcher measures eye color for a sample of n= 50 people. Which measure of central tendency would be appropriate to summarize the measurement? A. median B. any of these three measure C. mode D. mean 16. For the scores in the following table, what is the value of EX^2 ? x f 4 1 3 2 2 1 1 3 A. 65 B. 41 C. 225 D. 30 17. What is the value of (EX)^2 for the scores 1,0, 2,4 A. 14 B. 21 C. 28 D. 49