Twenty-five women between the ages of 70 and 80 were randomly selected from the general population of women their age to take part in a special program to decrease reaction time (speed). After the course, the women had an average reaction time of 1.5 seconds. Assume that the mean reaction time for the general population of women of this age group is 1.8, with a standard devia- tion of .5 seconds. (Also assume that the population is approximately normal.) What should you conclude about the effectiveness of the course