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Method of Difference Compares situations where the event occurs in one case, but not the other S1: P, Q, R, S → Event S2: P, Q, R → Event doesn’t occur What test might result in this outcome?

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Getting Rats in the Mood ♀ Rats:C, Cedar bedding, ♂1 Event (in the mood) ♀ Rats:No C, Cedar bedding, ♂1 No Event (not in the mood) Method of Difference

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Method of Agreement Compare factors of two cases where the same event occurs to see if there is a common factor between them S1: P, Q, R, S→ Event S2: T, U, V, S→ Event What test might result in this outcome?

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Getting Rats in the Mood ♀ Rats:Caffeine, Romantic Flick, Sexy ♂ Rats Event ♀ Rats: Caffeine, Disco, Homely ♂ Rats Event Method of Agreement

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Joint Method of Agreement & Difference Used to compare cases where an event occurs in some cases, but not others S1: P, Q, S→ Event S2: P, T, U→ Event S3: R, V, S→ Event Doesn’t Occur What test might result in this outcome?

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♀ Rats:Caffeine, Romantic Flick, Sexy ♂ Rats Event ♀ Rats: Caffeine, Disco, Homely ♂ Rats Event ♀ Rats:Popcorn, Romantic Flick, Stupid ♂ Rats No Event Joint Method of Agreement & Difference Getting Rats in the Mood

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Method of Concomitant Variation Varying a factor to see whether a change happens with that variation at the same time when a factor is altered S1: When X is increased, then Event occurrence rate increases S2: When X is decreased, then Event occurrence rate decreases What test might result in this outcome?

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Getting Rats in the Mood Increase in the amount of caffeine given to ♀ rats increases the likelihood that they’ll find the ♂ rats appealing Decrease in the amount of caffeine given to ♀ rats decreases the likelihood that they’ll find the ♂ rats appealing Concomitant Variation

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Getting Women in the Mood (instead of rats)

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Getting Women in the Mood ♀ Humans:C, Silk Sheets, ♂1 Event ♀ Humans:No C, Silk Sheets, ♂1 No Event Method of Difference

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Getting Women in the Mood But---What difference do you have to account for with women and not rats?

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Getting Women in the Mood So, what method could you use to determine whether habitual caffeine users are susceptible after a bigger than usual jolt of caffeine?

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Getting Women in the Mood ♀ Non-users C, ♂1 Event ♀ Users C, ♂2 Event Method of Agreement

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Getting Women in the Mood Increase in the amount of caffeine given to ♀ increases the likelihood that they’ll find the ♂ appealing Decrease in the amount of caffeine given to ♀ decreases the likelihood that they’ll find the ♂ appealing Concomitant Variation

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Getting Women in the Mood What method would you use to better isolate the extent to which caffeine is a significant variable that affects the female libido?

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Getting Women in the Mood ♀ 1: Caffeine, Romantic Flick, Sexy ♂ Event ♀ 2: Caffeine, Romantic Dinner, Homely ♂ Event ♀ 3: Vanilla Milkshakes, Drive-In Movie, Nerdy♂ No Event Joint Method of Agreement & Difference

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