Sample Test 3 (linear regression)

Sample Test 3 (linear regression) - George Mason University...

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George Mason University School of Management OM 210: STATISTICAL ANALYSIS FOR MANAGEMENT Prof. Harvey Singer TEST #3: Inference and Regression (SAMPLE) Simple Linear Regression Problem The sampled data listed below gives data for the total annual rainfall in inches and the yield of wheat in bushels per acre for each of the past eight consecutive years. Rainfall (inches/year) Wheat Yield (bushels/acre) 12.9 62.5 7.2 28.7 11.3 52.2 19.6 80.6 8.8 41.6 10.3 44.5 15.9 73.3 13.1 54.4 a. Explicitly define the independent variable x . Be as specific as necessary. b. Explicitly define the dependent variable y . Be as specific as necessary. c. By simple regression, state the equation of the straight line which best fits all the data so that wheat yield, in bushels per acre, can be predicted from the annual amount of rainfall, in total inches per year. (You must show your calculations for part c to receive credit.) d. On average, by how much is the wheat yield expected to change for each additional inch of rainfall? e.
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This note was uploaded on 02/19/2011 for the course OM 210 taught by Professor Singer during the Spring '08 term at George Mason.

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Sample Test 3 (linear regression) - George Mason University...

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