# HW#10 - HW#10 Nov 6 2006 ActivStats(a 1 The definition of...

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HW#10 Nov 6, 2006 ActivStats) (a) 1. The definition of the population is determined by what we want to know . 2. A “simple random sample” of size n is one in which each possible sample has an equal chance of selection . 3. It is often not possible , too expensive , or too inaccurate to examine every individual in the whole population. (b) 1. Biased sample design : favored people who could afford cars and phones. 2. Voluntary response : people unhappy with incumbent more likely to respond. (c) 1. Question wording , lack of privacy , ignorant responses , and interviewer effect . 2. population , sample ; bias , undercoverage , voluntary response , nonresponse , random , simple random sample , equal 8.4 #44) .05 α = (a) .001<.05 => reject (b) .021<.05 => reject (c) .078>.05 => don’t reject (d) .047<.05 => reject (e) .148>.05 => don’t reject 8.4 #48) (a) Using the t-distribution table for 8 df and t=2.0, P-value can be interpolated: .025 .05 .056 2.306 1.860 .025 ( .056)(2.306) .15426 P-value ( .056)(2) .15426 .042 m b b y - = = - - = - + = = = - + = (b) Using the t-distribution table for 11 df and t=-2.4, P-value can be interpolated: .01 .025 .029 2.718 2.201 .01 ( .029)(2.718) .088859 P-value ( .029)(2.4) .088859 .019 m b b y - = = - - = - + = = = - + =

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8.2 #27)
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HW#10 - HW#10 Nov 6 2006 ActivStats(a 1 The definition of...

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