A sampling technique in which a population for which there is no sampling frame and is divided into a set of smaller groups for which there are known sampling frames is known as

a. stratified sampling.
b. snowball sampling.
c. cluster sampling.
d. convenience sampling.

Psychology

Julie has fear about intercourse and pain in her pelvic region when having intercourse. Julie would be diagnosed with _________________.

Fill in the blank(s) with the appropriate word(s).

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Psychology

Stage 4 sleep is marked by __________ waves

a) alpha b) beta c) theta d) delta

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Psychology