spring2008stat201-hw04KEY

spring2008stat201-hw04KEY - 36-201 Spring 2008 Homework 4...

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This document available on: http://www.stat.cmu.edu/~gordonw/spring2008stat201.html 36-201 Spring 2008 Homework 4 – KEY
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Stat 201 Spring 2008 Page 1 of 8 Homework 4 – KEY This document available on: http://www.stat.cmu.edu/~gordonw/spring2008stat201.html Due: Wednesday, February 13 , 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 chapter 4 and the first section of chapter 5 in the course textbook. Point Distribution: Exercise 1 Exercise 2 Exercise 3 Exercise 4 Exercise 5 effort & neatness TOTAL 15 39 6 8 12 20 100 NOTE: To save paper, you are encouraged to print double-side (‘duplex’ mode).
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Stat 201 Spring 2008 Page 2 of 8 Homework 4 – KEY This document available on: http://www.stat.cmu.edu/~gordonw/spring2008stat201.html 1. Suppose a sociologist hears someone say that the reading level of Time Magazine is very low. To test if this is true, the sociologist decides to estimate the lengths of the words (i.e., the number of letters in each word) used in the publication (presumably, more sophisticated writing tends to use longer words). To conduct the study, the sociologist selects a copy of Time Magazine and opens it at random, and records the lengths of each of the first 30 words on the page. 1 (a) (i) What is the sample used in this study? [Hint: It may be helpful to consider how the researcher will record the data in a spreadsheet.] Answer: The 30 words. To the students: The sample is the set of individuals (or objects) for which something gets recorded. So the sample must be the set of words, each of which requires a different row in the ‘spreadsheet’: Word Length (number of letters) 1 3 2 5 3 2 The sample ± ² 30 4 (ii) What is the corresponding population? Answer: ‘All words on that page’ or ‘All words in that magazine’ or ‘All words in all Time Magazines’ ³ ´ ³ µ Any of these is ok. Remark for students: If the sample was a collection of words , then the population must have also been a (larger) collection of words . 1 (b)
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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-hw04KEY - 36-201 Spring 2008 Homework 4...

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