Three groups of males take a timed reaction test. All the males in Group 1 are aged 20. The males in Group 2 are all aged 40. The males in the last group (Group 3) are all aged 60. The statistic reported to describe the differences in reaction times between groups is each group's mean score. However, this mean score does NOT identify _______.

Question

Quizplus · Accepted Answer

The mean score only gives information about the average reaction time for each group, but it does not provide information about each individual's reaction time. Therefore, option C is the correct answer. The other options are possible conclusions that can be drawn from the reported means. Option A can be inferred if one of the groups has a significantly higher mean score than the others. Option B can be supported if there is a pattern of slower reaction times with increasing age. Option D is a possible interpretation if the job requires a specific age range and the group that falls within that range has the best reaction times.

Three Groups of Males Take a Timed Reaction Test