Explain prospective power analysis and how it relates to effect sizes.

What will be an ideal response?


Ans: Prospective power analysis means determining the sample size required to achieve a desired level of power, prior to running an experiment. The hardest part of prospective power analysis is determining the effect size that would be meaningful in the specific research setting. There is no rule to follow here. If a researcher thinks that an effect size of ? = .5 would be meaningful he or she must justify this decision. In some research settings this might be considered an extraordinarily large effect and in others it might be extraordinarily small. Once one has decided on the effect size of interest and desired level of power, it is necessary to use programs like Excel to compute the required sample size; this is prospective power analysis.

Psychology

You might also like to view...

Hermann Ebbinghaus is BEST known for research involving:

A) interpreting the flashing light illusion. B) memorizing nonsense syllables. C) inventing a conditioning chamber. D) examining cognitive errors in children.

Psychology

Social inhibition and negative affectivity are characteristic of which personality?

A. Type D B. negative C. Type B D. pessimistic

Psychology

ALL BUT WHICH of the following is a good example of a "lower-level" behavior, in the context of behavioral observation?

a. the number of times during class that a student behaves aggressively toward a classmate b. how many different classmates a student speaks to during a class period c. how many minutes of a class period a student spends out of his or her seat d. the number of times during class that a student raises his or her hand in response to a question from the teacher

Psychology

Who is BEST associated with a theory of "multiple intelligences?"

A. John Carroll B. Alfred Binet C. Howard Gardner D. Jean Piaget

Psychology