Which branch of psychology is the most recently developed approach??

In selecting representative samples, the technique that specifies that the researcher begins by identifying a large number of units of individuals who have a feature in common, and then randomly selects some of those units, is known as

a. simple random sampling. b. stratified random sampling. c. cluster sampling. d. nonprobability sampling.

When there is a failure to reject Ho then one may assume that the two sample

groups represent a common population. Indicate whether the statement is true or false