Each experiment described below, choose whether the experiment is blinded, doubl

Question

Each experiment described below, choose whether the experiment is blinded, double blinded, or not blinded. You have one attempt per question. In an experiment to test the effectiveness of an anti-depressant medication on clinical depression, an experimenter randomly assigns subjects who have been diagnosed with depression to take either pill A or pill B for three weeks. One of the pills is the anti-depressant: the other pill is a placebo (i.e. not real medication: a "sugar pill"). At the end of the three weeks, the experimenter administers a depression inventory questionnaire to all of the subjects. Neither the subjects nor the experimenter are aware of which pill is the medication and which is the placebo. This experiment is: _____ In an experiment to compare the effects of Red Bull and coffee on alertness, an experimenter randomly assigns a group of volunteers into one of two groups. The people in the first group are given a can of Red Bull to drink: the people in the second group are given a cup of coffee to drink. After twenty minutes, the experimenter administers a test of alertness to all of the subjects in both groups. This experiment is: _____ An experimenter would like to test whether or people can be "primed" to walk slowly using subtle references to old age. She gets a group of volunteers, and one by one administers a test that they believe is a language test, in which each volunteer is asked to construct a sentence from a group of scrambled words. Some of the volunteers are given words like "old", "geriatric", and "elderly": others are not. The volunteers are not told the true purpose of the experiment. After each test is administered, the experimenter uses a -stopwatch to time how quickly each volunteer walks down the hallway leading out of the building. She suspects that those who have been primed with references to old age will walk more slowly than those who have not. This experiment is: _____ In an experiment to see if my friends prefer my homebrewed beer to a similar style of store-bought beer, I arrange a "tasting" one afternoon in my backyard without letting any of my friends see what I'm doing, I go in my kitchen and pour all of my homebrewed beer into red plastic cups and all of the store bought beer into blue plastic cups. I then bring the cups outside and have my friends try one of each and tell me which they like better doing, This experiment is Classify each of the following variables by type and (level). You have one attempt per question (a) Brand of computer purchased by a customer

Explanation / Answer

1. double Blinded, because neither the experimenter nor the subjects are aware of which pill is the medication and which is the placebo

2. Blinded, because the subject doesnot know if they are in experiment group or control group

3.Not blinded, because experimenters bias may be present during the experiment, i.e. while s(he) give words to the volunters

4. Blinded,  because the subject doesnot know if they are in experiment group or control group

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