Practice Exam1 Solution

Practice Exam1 - AMS102.04Fall2010 1 A study was conducted to estimate the average length of a prison sentence for prisoners at a correctional

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AMS102.04                                                        Fall 2010 Practice Exam 1 Solution 1. A study was conducted to estimate the average length of a prison sentence for  prisoners   at   a   correctional   facility.   A   random   sample   of   current   prisoners   was  obtained on a particular day, and they were monitored to the completion of their  sentence. The information from this sample was used to estimate the average length  of a prison sentence. (a) What is the population of interest? The population of interest is all individuals who have or are currently serving a  prison sentence at this facility. (b) What is the sample? The sample consists of a few current prisoners serving a sentence. (c) What is the variable of interest? The variable of interest is the length of sentence served, in years. (d) Is there a bias? If so, which bias does exist? Yes, there is a selection bias: Note: Only those prisoners currently serving a sentence on that day had a   chance to be sampled. Those prisoners serving a longer sentence are more  likely to still be in the facility on that day compared to those serving a shorter   sentence and may have already been released.  2. Suppose that a population consists of four females with response values 1, 2, 3, and  4, and three males whose response values are 5, 6, and 7. A simple random sample  of size n=3 females results in the sampled responses {1,2,3} and thus an estimated 
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This note was uploaded on 09/28/2010 for the course AMS 102 taught by Professor Adriennechu during the Fall '08 term at SUNY Stony Brook.

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Practice Exam1 - AMS102.04Fall2010 1 A study was conducted to estimate the average length of a prison sentence for prisoners at a correctional

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