A researcher is interested in how a color video display rather than a black-and-white video display can help a person assimilate the information provided on a screen. A set of 22 experimental subjects are used, and each person undergoes five trials with a color display and five trials with a black-and-white display. In each trial the subject has to perform a task based upon information provided on the screen, and the time taken to perform the task is measured. For each of the 22 subjects. DS 9.6.1 shows the average time in seconds taken to perform the five color trials and the five black-and-white trials. Do the data show that color displays are more effective than black-and-white displays?