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Study Set - Sampling and Sampling Distributions

Study Set - Sampling and Sampling Distributions - MIDDLE...

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1 MIDDLE EAST TECHNICAL UNIVERSITY NORTHERN CYPRUS CAMPUS BUS 152 STATISTICS FOR SOCIAL SCIENCES SPRING 2011 STUDY SET: SAMPLING AND SAMPLING DISTRIBUTIONS Problem 1. Suppose that 5,000 sales invoices are separated into four strata. Stratum 1 contains 50 invoices, stratum 2 contains 500 invoices, stratum 3 contains 1,000 invoices, and stratum 4 contains 3,450 invoices. A sample of 500 sales invoices is needed. a. What type of sampling should you do? Why? b. Explain how you would carry out the sampling according to the method stated in (a). c. Why is the sampling in (a) not simple random sampling? Problem 2. A simple random sample of n = 300 full-time employees is selected from a company list which contains the names of all N = 5,000 full-time employees in order to evaluate job satisfaction. a. Give an example of possible coverage error. b. Give an example of possible non-response error. c. Give an example of possible sampling error. d. Give an example of possible measurement error.
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