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Assignment9new

# Assignment9new - Name Psychology1167 Assignment9 Duedate...

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Name:________ Psychology 1167 Assignment 9 Due date: 12/7/10 SHOW YOUR WORK. You are the teacher of a small stats class. All your students’ exam grades are as follows: Exam 1 Exam 2 71.56 76.78 77.68 71.50 75.32 79.34 83.39 72.28 79.89 77.61 68.31 70.95 73.81 56.78 85.48 65.20 69.31 78.63 68.91 93.19 78.60 83.51 76.05 69.86 79.86 86.55 82.93 89.67 85.40 88.38 84.88 82.28 82.35 89.85 96.13 86.76 85.38 83.54 83.29 96.95 92.42 81.33 85.31 87.68 82.81 89.56 81.61 90.84 78.79 84.83 Part 1. For both exam 1 and exam 2, do the following: 1. What kind of variables are these? Answer completely.

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2. Calculate the mean, median, and mode. (3 points) 3. Assess the skewness of these data. (1 point) Which measure of central tendency is best to use in this situation? (1 point) 4. Create a cumulative frequency distribution for each. (5 points) 5. Create a histogram for each. (3 points) 6. Calculate the SS x , variance and standard deviation for these exams. Include all units of measurement. (3 points) 7. Calculate the range, IQR and Q of these exams. To calculate the IQR and Q, use the percentile/z-score method we discussed briefly in class. You may assume that these data are normally distributed. Which exam had more
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