When researching a hidden populations, investigators typically cannot use
a. techniques to reduce impression management.
b. respondent-driven sampling.
c. chain-referral methods.
d. probability samples.
D
Psychology
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The principle of ____ suggests that physical properties of substances, such as volume, number, and mass, remain constant in spite of changes in their shape or appearance.
a. object permanence b. centration c. egocentrism d. conservation
Psychology
What proportion of patients fail to adhere to their doctors' orders?
a) one in ten b) one in twenty c) one in four d) one in two
Psychology