Why is polling people via the Internet likely to produce a nonrandom sample?
a. Not all people who are part of a prospective random sample own cellphones.
b. Not all people who are part of a prospective random sample own computers.
c. Not all people who are part of a prospective random sample will answer open-ended questions.
d. Not all people who are part of a prospective random sample have opinions on issues of interest to researchers.
b
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Protecting against threats to internal validity is
A) a major aim of experimental design. B) of maximum concern in naturalistic research. C) achieved when sample size is equal in each group. D) the main purpose of differential design.
Unlike affluent communities, cities lack the tax base to provide adequate per-student expenditures, even with additional state aid
Indicate whether the statement is true or false.