A92 ODD ANSWERS 4. There is not enough evidence at the 10% level of significance to reject the administrator’s claim that the standard deviations of reading test scores for eighth-grade students are the same in Illinois and Georgia. 5. There is not enough evidence at the 5% level of significance to reject the claim that the distributions are the same. 6. There is not enough evidence at the 5% level of significance to conclude that the adults’ ratings of the movie are dependent on generation. 7. (a) 0.743; About 74.3% of the variation in height can be explained by the relationship between metacarpal bone length and height, and about 25.7% of the variation is unexplained. (b) 3.93; The standard error of estimate of the height for a specific metacarpal bone length is about 3.93 centimeters. (c) 169.95 6 y 6 189.72; You can be 95% confident that the height will be between 169.95 and 189.72 centimeters when the metacarpal bone length is 50 millimeters. Appendix C Appendix C (page A30) 1. The observed values are usually plotted along the horizontal axis. The expected z-scores are plotted along the vertical axis. 3. Because the points appear to follow a nonlinear pattern, you can conclude that the data do not come from a population that has a normal distribution. 5. 300 520 3.5 −3.5 Because the points are approximately linear, you can conclude that the data come from a population that has a normal distribution.
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