Practice Problem Activity Chapter 6 *For all assignments, show your work (that means ALL steps of your work; nal answers only are awarded 0 points), only use formulas/procedures from this course (especially applies to standard deviation and variance), round to hundredths place, and submit les in the formats noted in the assignment instructions. *Also note that you should NOT share your work with others. If you work together. discuss the assignment verbally only. If 2+ students submit the same work, the assignment is given an automatic 0 for the rst offense. Additional enalties a I if the behavior continues see the syllabus and student code of conduct). 1. Two students are arguing over which performed better, in the context of their class, on the rst exam. Student A earned an 85 on her test in General Psychology. The class's mean was 84 with a standard deviation of 5. Student B earned a 75 on her test in statistics. The class's mean was 70 with a standard deviation of 5. Who performed better on these exams, Student A or Student B? How do you know? SHOW YOUR WORK (and remember that z scores are decimal, not fractions)! 2. A population of scores has mean = 200 and SD = 25. - Find the raw (X) score corresponding to a z score of -1.5 - Using the same population data, nd the raw score corresponding to a z score of +0.75 3. The mean IQ score for a group of college graduates is 105, with a standard deviation of 10. In what percentile would a graduate who scored 115 fall? 4. The mean IQ score for a group of college graduates is 105, with a standard deviation of 10. In what percentile would a graduate who scored 90 fall? 5. A population consists of the following scores: 7, 6, 9, 10 a. Compute mean and standard deviation for the population. Follow steps from THIS CLASS. Do not use an alternate formula