Migraines Some people claim they can get relief from migraine headache pain by drinking a large glass of ice water. Researchers plan to enlist several people who suffer from migraines in a test. Participants will be ran- domly assigned to a standard pain reliever or a placebo. When a participant experiences a migraine headache, he or she will take the pill. Half of each group will also drink ice water. Participants will then report the level of pain relief they experience. a) Identify the factors and levels in this experiment. b) Identify the treatments and the response variable. c) Is there any blinding described in the study? d) No blocking is described in the study. What might be an appropriate variable on which to block? Clearly explain why you think this variable would be appropriate.
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
Migraines Some people claim they can get relief from migraine headache pain by drinking a large glass of ice water. Researchers plan to enlist several people who suffer from migraines in a test. Participants will be ran- domly assigned to a standard pain reliever or a placebo. When a participant experiences a migraine headache, he or she will take the pill. Half of each group will also drink ice water. Participants will then report the level of pain relief they experience.
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a) Identify the factors and levels in this experiment.
-
b) Identify the treatments and the response variable.
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c) Is there any blinding described in the study?
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d) No blocking is described in the study. What might
be an appropriate variable on which to block? Clearly explain why you think this variable would be appropriate.
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