The primary means scientists use to establish control in their observations is to
A. systematically manipulate an independent variable in an experiment.
B. train multiple observers.
C. establish the accuracy and precision of their measurements.
D. observe many dependent variables.
A. systematically manipulate an independent variable in an experiment.
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Our assumption that population variances are equal is called the assumption of
a. equal dispersion. b. heterogeneity of variance. c. homogeneity of variance. d. pooled variances.
Some experiments use a(n) ____________________ procedure in which participants are not informed about whether they are in the experimental or control group
Fill in the blank(s) with correct word
Juliana is nearsighted; therefore images of distant objects are focused _________ the retina
a. behind c. above b. in front of d. below
Men with higher hostility are more likely to engage in sexual harassment in the workplace under conditions of perceived unfairness
Indicate whether the statement is true or false