1. Researchers dropped 200 identical wallets on sidewalks near a large university. Each wallet contained the name and address of the owner and either a photograph of a baby, a photograph
of a puppy, a photograph of a young family, a photograph of an older couple, or no photograph.
The researchers hypothesized that the type of photographs left in the wallet would influence
the rate of return. The wallets with a photograph of the baby and the wallets with a photograph
of the puppy were left early in the morning, the wallets with a photograph of the young family
were left in the afternoon, and the wallets with either no photograph or a photograph of an
older couple were left in the evening.
Identify the following aspects of the study as described above.
a) Control condition.
b) Dependent variable.
c) Independent variable.
d) Confounding variable.