Concept explainers
When you get a surprisingly low price on a product
do you assume that you got a really good deal or that
you bought a low-quality product? Research indicates
that you are more likely to associate low price and low
quality if someone else makes the purchase rather than
yourself (Yan & Sengupta, 2011). In a similar study,
n = 16 participants were asked to rate the quality of
low-priced items under two scenarios: purchased by a
friend or purchased yourself. The results produced a
mean difference of MD = 2.6 and SS = 135, with selfpurchases rated higher.
a. Is the judged quality of objects significantly different for self-purchases than for purchases made by
others? Use a two-tailed test with a = .05.
b. Compute Cohen’s d to measure the size of the
treatment effect.
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