Dr. Halk is studying the influence of getting older on intelligence. He tests a group of first graders, a group of third graders, and a group of sixth graders. They are all tested in one day. This is an example of _______ research

a. cross-sectional
b. longitudinal
c. mixed design
d. fixed effects

Psychology

Mr. Farber can't remember where he put his car keys. This is a problem of ______ memory

A) episodic B) semantic C) eidetic D) procedural

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Psychology

The mean and the mode fall at the same point in ________ distributions

a. flat b. skewed c. bimodal d. normal

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Psychology