stats 363 HW 7-2

stats 363 HW 7-2 - . ( a ) Convenience sample. ( b ) This...

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Section 7.2 Exercise 7.1 . You can select a simple random of size n = 20 using Table 10 each number. Since the experimental units have already been numbered from 000 identify the proper experimental unit. For example, if the three digits are 742, you should select the experimental unit numbered 742 500 = 242. The probability that any three-digit number is selected is 2 = 1000 = 1 = 500. One possible selection for the sample size n = 20 is 242 134 173 128 399 056 412 188 255 388 469 244 332 439 101 399 156 028 238 231 Exercise 7.11
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Unformatted text preview: . ( a ) Convenience sample. ( b ) This sample of 35 individuals with knee pain is assumed to a simple random sample. Each simple sample of size 35 has the same chance of selection. ( c ) Yes, but only if his patients behave like a random sample from the general population. ( d ) In order to cover the entire population of his patients, a systematic random sample may be considered. Exercise 7.13 . ( a ) The &rst question is more unbiased. sample. ( b ) Notice that the percentage favoring the new space program drops dramat-ically when the phrase \spending billions of dollars" is added to the question....
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