Assignment #1: Descriptive Statistics, Percentiles



Assignment #2Z-scores, Normal Distribution and Statistical InferenceDue Friday, October 16th at 5pmYou may hand in the assignment during section or place it in the box in CERAS 444 by 5pm. Again, we encourage you to form groups for doing the homework. If you don’t know anyone in the class you want to work with, let Carrie know and she can set up groups. Anywhere between 2 and 4 people is generally a good size. While you are encouraged to work together, each person needs to write up their own work individually. This is to help you prepare for both the exams and for your own future research, in which you might often be working on your own. Note that one of the exercises this week explicitly asks you to work in a group. All of the calculations on this problem set should be done “by hand”, with the obvious assistance of a calculator. If you are comfortable using excel, please feel free to use excel for these problems. I. Z-scoresText pages 104-106:Exercises #1 & #6 (For #6 only do z-scores, not T scores and SAT scores). Note: For #6, you can either calculate s (dividing by N-1) or (dividing by N), just be clear which one you are using.Thought Question #2II. Normal DistributionText pages 120-121:Exercises #2, #3, and #4Thought Questions #3 & #4III. Basic Inferential StatisticsText pages 146-148: Exercises #1 & #4 (Note: Do Exercise #4 in a group with 2-4 students. This can be your homework group, if you have one.)Thought Questions #5 & #6 If you are curious…1) Assuming that GRE scores follow the same distribution as SAT scores, calculate the z-scores for your math and verbal GRE scores and calculate what percentage of students nationwide scored lower than you on each test. 2) What is the minimum GRE score needed to rank in the top 1% of the population? ................
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