spring2008stat201-hw12KEY

spring2008stat201-hw12KEY - 36-201 Spring 2008 Homework 12...

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This document available on: http://www.stat.cmu.edu/~gordonw/spring2008stat201.html 36-201 Spring 2008 Homework 12 – KEY
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Stat 201 Spring 2008 Page 1 of 12 Homework 12 – KEY This document available on: http://www.stat.cmu.edu/~gordonw/spring2008stat201.html Due: Wednesday, April 30 , at the beginning of lecture. Homework considered late beyond the first 10 minutes of lecture. Late Homework Policy: Late homework may be turned-in for a maximum of half credit, up to 4:00 PM on the same Wednesday the homework is due. Late homework should be placed in the manila envelope which will be posted by room 328-C, Facilities Management Building (FMS). Late homework should be labeled with the course as well as your name. Please do not turn in any homework to any mailboxes. Please include the top-page ‘coversheet’, filled-out and stapled to your homework. Show all work. This homework covers chapters 9, 10, and 11 in the course textbook. For grading purposes: Exercise 1 Exercise 2 Exercise 3 effort & neatness TOTAL 20 100 NOTE: To save paper, you are encouraged to print double-sided (‘duplex’ mode).
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Stat 201 Spring 2008 Page 2 of 12 Homework 12 – KEY This document available on: http://www.stat.cmu.edu/~gordonw/spring2008stat201.html IMPORTANT NOTES: NOTE 1: The FINAL EXAM will be held Monday, May 5, from 1:00 PM to 4:00 PM, in UC McConomy NOTE 2: The FINAL EXAM will cover the material through this homework (hw 12). You may want to keep a photocopy of this assignment to study from, before turning it in. 1. ‘Caffeine dependence’ is now a recognized medical condition. The research study that first named this condition was “Caffeine dependence syndrome,” by Strain, et al, Journal of the American Medical Association , 272 (1994), pp. 1604-1607. In the study, a random sample of eleven coffee-drinkers was first made to abstain from caffeine (in order for everyone to be at ‘baseline’). The study was then conducted as follows: Each subject was given a caffeine pill at a certain moment, and the subject was scored on a standard psychological questionnaire measuring depression (higher score representing more depression); then, at another time, each of the eleven subjects was given a placebo pill, and their depression level was scored again. [The subjects didn’t know which pill they were getting at which time, and the research assistants who handed out the pills also didn’t know which were which (i.e., the study was ‘double-blind’).] Here are the raw results*: *As reported in The Basic Practice of Statistics , by David S. Moore, p. 382. We are interested in formally testing whether the study gives good evidence that mean depression overall is lower with caffeine. [exercise 1 continues on next page] Subject Depression with caffeine Depression without caffeine 1 5 16 2 5 23 3 4 5 4 3 7 5 8 14 6 5 24 7 0 6 8 0 3 9 2 15 10 11 12 11 1 0
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Stat 201 Spring 2008 Page 3 of 12 Homework 12 – KEY This document available on: http://www.stat.cmu.edu/~gordonw/spring2008stat201.html 1 (a) [ categorizing the data type ] Based on the study design, choose the most appropriate type of statistical procedure: One-sample Two independent samples
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This note was uploaded on 02/01/2009 for the course STAT 36-201 taught by Professor Gordon during the Fall '08 term at Carnegie Mellon.

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spring2008stat201-hw12KEY - 36-201 Spring 2008 Homework 12...

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