Their scores (in msec) are shown below:

Simple RT: 205, 230, 280, 320, 390

Choice RT: 300, 310, 380, 410, 502, 570

M

M

The problem is to estimate the difference between simple and choice reaction time by computing the 95% confidence interval on the difference. The elements required to compute the interval are: the z for the 95% confidence interval, the mean difference (M

z = 1.96

M

and =