0910SEM2-ST3239 - NATIONAL UNIVERSITY OF SINGAPORE...

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-------------------------- NATIONAL UNIVERSITY OF SINGAPORE EXAMINATION ST3239 Survey Methodology April 2010 - Time allowed: 2 hours INSTRUCTIONS TO CANDIDATES 1. This examination paper contains Five (5) questions and comprises Fourteen (14) printed pages. 2. Answer ALL questions. Marks for each question are indicated at the beginning of the question. 3. Candidates may use non-programmable cal - culators. However, they should layout sys - tematically the various steps in the calcula- tions. 4. This is a CLOSED BOOK examination. Candidates are allowed to bring TWO help pages written on BOTH sides. Matriculation No. 1 2 3 4 5 T
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PAGE 2 ST3239 1. [15 points] Consider an agricultural region consisting of N 2010 farms. From the land registry records it is known that there are 1580 farms with less than 160 hectares and 430 farms with more than 160 hectares. A surveyor is interested in average surface area of cereals cultivated. Larger farms on an average tend to devote more area to cereals than the smaller farms. Using a simple random sample a surveyor draws n = 100 farms. The
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