A pilot study reveals a wide variation in measurement values among subjects with an overall mean value that is higher than among the general population.By increasing the sample size in a subsequent study,the researcher expects to
A) decrease the variation of scores among subjects.
B) increase the variation of scores among subjects.
C) decrease the mean value of scores among subjects.
D) increase the mean value of scores among subjects.

Question

Quizplus · Accepted Answer

The random variation of scores is the expected difference in values that occurs when different subjects from the same sample are examined.As sample size is increased,this variation decreases.The systematic variation is related to selecting subjects whose measurement values differ from those of the population.Increasing the sample size has no effect on mean scores.

A Pilot Study Reveals a Wide Variation in Measurement Values