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Part 1
For the following experiment, indicate whether it was single-blind, double-blind, or not blinded at all. Explain your reasoning.
Does a "stop smoking" program work better if it costs more? Smokers responding to an advertisement offering to help them quit were randomly offered a program costing $100 or the same program costing $250. The offer was made individually to each client by presenting a sealed envelope so the clerk providing the offer did not know the details of the offer. After the program, clients were followed for six months to see if they had indeed quit smoking.
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Part 1
Choose the correct answer below.
A.
The experiment was single-blind because the clerks were administering an experiment, but the customers did not know that they were involved in an experiment.
B.
The experiment was double-blind because neither group of customers knew that there was an alternative price.
C.
The experiment was double-blind because the clerks did not know how much the customers paid, and the customers did not know there was an alternative price.
D.
The experiment was not blinded at all because both the clerks and the customers knew which program they were participating in.
E.
The experiment was single-blind because the clerks did not know how much the customers paid, but the customer had to know how much to pay to participate.