A B C D E F G H K L 2009 2006 NJ Mean: A.) Mean: A.) Standard Deviation: A.) Standard Deviation: A.) 4 5 All students All students Average Standard Average Standard 6 Year Jurisdiction scale score Z-scores error Year Jurisdiction scale Z-scores error Change 2009 International 496 (0.5) 2006 International Average 494 (0.5) 7 Average (OECD) Average for 496 (0.5) Average for Selected 494 (0.5) 8 Selected Countries Australia 514 (2.5) Australia 520 (2.2) 9 10 Austria 496 (2.7) Austria 505 (3.7) 11 Belgium 515 (2.3) Belgium 520 (3.0) 12 B.) B.) B.) 13 14 C.) a.) How do I compute the mean and standard deviation of the scores for the countries for each year. b.) Compute the z-score for each country Belgium Improvement for both years, and compute the change in z-score for each country from 2006 to 2009. If the scores go up, the change should be positive. 15 from 2006-2009: standard deviations c.) By how many standard deviations did Belgium improve