11-33. An experiment was conducted to compare the reaction times of a group of 10 volunteers (from a psychology class) to a bright light versus the sound of a loud air horn. When signaled with either the light or horn, the individual was asked to press a button to turn off the light or to turn off the horn. Aspecial timing device monitored the reaction times (expressed in seconds):

Subject Light(X) Horn(Y)

1 0.31 0.29 2 0.37 0.30 3 0.41 0.38 4 0.33 0.35 5 0.21 0.25 6 0.38 0.29 7 0.38 0.31 8 0.47 0.37 9 0.95 0.21 10 0.25 0.22 Find a 95% confidence interval for μD = μX − μY.