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hw1sol - STAT 401 Homework 1 Section 1.2 2(a The three...

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STAT 401: Homework 1 Section 1.2 2. (a) The three varieties of corn (b) The three varieties of corn from the 10 randomly selected plots (c) Yield of corn 4. (a) Population of interest is all domestic flights, the population unit is a single domestic flight (b) The 175 domestic flights measured. (c) Degree of staleness 5. (a) Two populations (b) The first population is the class taught traditionally, and the second population is the class taught with computer activities. (c) Not hypothetical, test scores of students available. (d) The students in each class. Section 1.4: 2. (a) No, it is not a simple random samples. (b) One cannot obtain 40 from A, 20 from B, and 40 from C as you could for a simple random sample. This is instead a stratified random sample. 3. (a) All drivers. (b) No, because the sample is not random, it excludes for example older drivers. (c) It is a convenience sample. (d) Probably underestimate, since but answers may vary. 4. (a) First assign numbers 1 - 1000 to the 1000 clients from the last year, and then use a random o number generator to select 100 of them.

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