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Answer the following questions after reading the following (short) empirical article: Rind, B., & Strohmetz, D. (1999). Effect on restaurant tipping of a helpful
Answer the following questions after reading the following (short) empirical article: Rind, B., & Strohmetz, D. (1999). Effect on restaurant tipping of a helpful message written on the back of customers' checks. Journal of Applied Social Psychology, 29(1), 139-144. What is the IV and its levels?
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