Question 13 of 21> Classify each of the hypothetical experiments as double blind

Question

Question 13 of 21> Classify each of the hypothetical experiments as double blind, single blind, or unblinded. At least one experimental technique will be used more than once. A pharmaceutical company claims that their new eye drop formula is more effective at treating glaucoma than the standard one. A group of doctors decide to test the claim, and they ask their patients to choose which type of eye drop they would like to receive. The doctors keep track of the number of patients prescribed each formula that go blind within five years. A baker wants to test if his customers can taste the difference between his regular and his sugar-free chocolate cupcakes. He gives both cupcakes to each of 100 customers, randomly varying which type of cupcake is presented on the left. After tasting both cupcakes, he asks each customer which cupcake is sugar-free. A marketing researcher hires three different artists to design a new animal spokesperson for his company. The researcher has a favorite but wants to determine which will be most beloved by the American public. He sends out an anonymous online survey with pictures of the three animal spokespersons to 10,000 randomly selected people. In each survey, the position of the animal spokespersons on the screen is randomized. about us careers privacy policy terms of usecontactus | help

Explanation / Answer

Blinded experiments are when information about the test is hidden from the participant, to reduce or eliminate bias, until the trial outcome is recorded.

Single blind: Participant is unaware

Double blind: Both, Tester and Participant are unaware

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1. Both the doctors and the participants know what each participant is choosing => Unblinded

2. The Baker knows the order of the cupcakes he gave to each tester, but the testers are unaware => Single-blind

3. The Researcher knows which receiver was sent which animal spokesperson. The testers are unaware of any thing about the test and just receive an anonymous mail => Single-blind

4. The participants do not know whether they have got the real medicine or the placebo. Also, the researcher has no direct contact with Participants and the administration was at random => Double-blind

5. The participants do not know anything about the test other than the CD they have received. The psychologist does not know which Participants got which CD => Double-blind

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