HW1_sol_Fall_2007 - STAT 401: Homework 1 (Fall,2007) 1.2.1...

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STAT 401: Homework 1 (Fall,2007) 1.2.1 1. i. Population of interest: Air in all possible airplanes, Population Unit: Airplane ii. Sample: Measured degree of stalenss on 175 domestic flights. 2. i. Two population ii. The first population is the class taught traditionally, and the second population is the class taught with computer activities. iii. Hypothetical iv. The students in both sections who participated in the experiment. 3. i. The entire customer satisfaction for cars sold during the previous year. ii. Not hypothetical. 1.4.5 2. The second choice is closer to a simple random sampling. 3. i. Take a simple random sample from the entire collection of last year’s customers. This will give an overall picture of the degree of customer satisfaction, but not specific to each type of car. ii. Take a stratified random sample, with car type being the strata. This will provide type-specific information on customer satisfaction, as well as the overall degree of customer satisfaction. 4. No. This is because with this sampling scheme, samples that consist of products
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This note was uploaded on 07/17/2008 for the course STAT 401 taught by Professor Akritas during the Fall '00 term at Pennsylvania State University, University Park.

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HW1_sol_Fall_2007 - STAT 401: Homework 1 (Fall,2007) 1.2.1...

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