hw 3 - 4: 2, 22, 23, 30, 34, 36, 40, 42, 50, 58 Paul Tucker...

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4: 2, 22, 23, 30, 34, 36, 40, 42, 50, 58 Paul Tucker STAT 280 Sarah Thomas HW #3 4.2 a) Observational study; the study did not create control groups in order to isolate the response variable. b) because mobile phone use could not be isolated as the only response variable, the frequency of tumors cannot be causally linked. 4.22 The difference probably stems from response bias: the subjects lie to the interviewer when they perceive their response may offend. 4.23 a) The question presupposes that the flag is a negative symbol, associating it with obvious bads (like slavery and extremism). b) The second option does not lead the subject toward one position. It gives the subject the option to oppose or support the flag, and it leaves out reference to obviously negative associations. 4.30 a) Church of Scientologist surveys taken on the street (volunteer surveys) suffer from sampling bias. b) Internet surveys lead to undercoverage—they do not cover people without internet access. c) Student life surveys at Rice University are almost always horribly worded and I believe
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hw 3 - 4: 2, 22, 23, 30, 34, 36, 40, 42, 50, 58 Paul Tucker...

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