as091-soln - STAT 454/854 Short Solutions to Assignment 1 1...

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STAT 454/854 Short Solutions to Assignment 1 1. For each of the following surveys, describe the target population, sampled population, sampling frame, response variable(s) and population quantities of interest. Discuss specific structures of the population (if any), possible problems with the sampling frame and/or with the survey data. (a) A student randomly selects two pages from each of the 12 chapters of Sharon Lohr’s book and carefully counts the number of typos on each of the selected pages. She reports that the estimated total number of typos in the book is between 65 and 80. Target population: All pages in Sharon’s book Sampled population: All pages from the 12 chapters Sampling frame and sampling unit: 12 lists of pages, one for each chapter; sam- pling unit = page Response variable: number of typos on each page Population quantity of interest: total number of typos in the book Population structure: Stratified (stratum = chapter) (b) A survey conducted by the Dean of Mathematics last year indicates that about 15% of UW Computer Science graduates go to positions in the United States. Data were collected through questionnaires mailed to graduates from the past five years. Target population: All CS graduates in the past five years Sampled population: All CS graduates in the past five years who could receive the questionnare and who will respond to the survey Sampling frame and sampling unit:
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