HW Week 1.docx - UMUC STAT-200 Homework Assignments Dr...

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UMUC STAT-200 Homework Assignments Week #1 Dr. Brian Killough Textbook #1: Lane et al . Introduction to Statistics, David M. Lane et al., 2013. ( ) Textbook #2: Illowsky et al . Introductory Statistics, Barbara Illowsky et al., 2013. ( ) Lane - Chapter 1: 3,10,17,18 3. If you are told only that you scored in the 80th percentile, do you know from that description exactly how it was calculated? Explain. Yes, using the formula R=P/100 x (N+1) . After this step, if the number given is not an integer, you calculate further by finding the scores of rank IR and rank IR+1, find the difference between the 2, multiply by FR then add to rank IR. 10. For the numbers 1, 2, 4, 16, compute the following: ΣX, ΣX 2 , and (ΣX) 2 EX= 23 EX^2= 277 (EX)^2=529 For #17 and #18 see the ADHD Treatment Case Study (Page 624, ) 17. What is the independent variable of this experiment? How many levels does it have? The independent variable is the amount of dosage given to the children; there are 4 different levels, counting the placebo.
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  • Fall '09
  • Chief Executive Officer, relative frequency, Lake Tahoe Community, Lake Tahoe

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