Suppose you were asked to identify lurking variables that would be associated with the news headline: “Study shows kids who were spanked have lower IQs.” Certainly, there are plenty of lurking variables to cast doubt on cause and effect. Think about what it would take to do an experiment to determine if spanking causes lower IQs. Design an experiment and point out why it is not ethical.

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Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota

Atravel agent is booking a trip to england, scotland, ireland, and france for a group of senior citizens. the agent sent surveys to the group, asking which countries they would like to visit, in order, and created the shown preference schedule (e = england, i = ireland, s = scotland, f = france). which country is the condorcet winner? number of votes 15 12 16 19 1st f e e i 2nd e s i s 3rd s i s e 4th i f f f 1. scotland 2. england 3. france 4.ireland