64.
. . . . . . . . means that a subject has an equal chance of being a member of either the experimental group or the control group.

68.
The method which is used to study adjustment problems and therapies in psychological clinic, it is called . . . . . . . .

69.
A problem with the survey method is that answers to questions may not always be . . . . . . . . or . . . . . . . .

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