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IB HL Psychology Exam (Paper 1) Kerr (1983) - 1.) Asked 75 undergrad males to pump air into a small ball 2.) 4 conditions: alone, with a capable partner who worked hard, with a capable partner who did not work hard, and alone but with another person doing the same test with little effort 3.) Person with a capable partner who worked hard pumped less: free rider effect 4.) Person with capable partner who did not work hard pumped less: sucker effect 5.) First and fourth condition similar ...