Why do psychologists select a random sample of research participants?

In respect to this, why are researchers careful to use large representative samples in their studies?

Larger,representative sample sizes help ensurereliable and validresults. psychologist accepts a 5 percentlikelihood thatthe results occurred by chance.

One may also ask, how can contemporary psychology best be defined? Contemporary psychology is best definedasthe scientific study of: Behavior and mental process.Whowould have been most likely to ignorementalprocesses and to define psychology as "the scientificstudyof observable behavior"?

Also to know is, is psychology potentially dangerous?

psychology can be potentiallydangerousbecause psychology is knowledge.

Which coefficient expresses the strongest correlation?

The greater the absolute value of thePearsonproduct-moment correlation coefficient, thestrongerthe linear relationship. The strongestlinearrelationship is indicated by acorrelationcoefficient of -1 or 1. The weakest linearrelationshipis indicated by a correlation coefficientequal to0.