If P + Q = 1.00 then P and Q must be _________
a. mutually exclusive
b. exhaustive
c. random
d. both mutually exclusive and exhaustive
D
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The dramatic rise in obesity since the 1980s seems to have been caused by __________.
A. genetic mutations B. an as-yet-unknown combination of genes C. a trend for people to eat more calories per day and to be less physically active D. a trend toward people getting less and less sleep
A distribution of sample means based on random samples of a fixed size from a population is the _____
a. standard error of the mean b. z test c. population distribution d. sampling distribution
Children first begin to show awareness of gender-role stereotypes
a. by their first birthday. b. about the age when they recognize that sex is an unchanging attribute. c. after they have entered grade school. d. at the time when they accurately label themselves as either a boy or a girl.
Bipolar depression differs from major depression in that:
a. bipolar depression typically involves periods of mania b. bipolar depression involves depression caused by two distinct sources c. major depression is less common d. bipolar depression is often complicated by further emotions such as guilt