An Investigator Wishes to Determine Whether the Difference Between Two

Multiple Choice

An investigator wishes to determine whether the difference between two groups of participants is statistically significant. To answer that question, the investigator must first determine the difference between the means of the two groups, the number of participants in each group, and

A) the age of participants in each group.
B) the duration of the experiment in hours.
C) the amount of variation in each group.
D) the strength of motivation by members of each group.