We care a great deal about areas under the normal distribution because

a. they translate directly to expected proportions.
b. they are additive.
c. they allow us to calculate probabilities of categories of outcomes.
d. all of the above

D

Psychology

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Melatonin is a __________

a) hormone. b) sleeping pill. c) depressant. d) stimulant.

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The "69" sexual position may be practiced side by side

Indicate whether the statement is true or false

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