1. Plot relative frequency polygons for the two sets of scores in Data 3A on the same graph. Compare the two distributions and record your conclusions.
2. For the reaction times to complex stimuli in Data 3A:
(a) Tabulate the cumulative frequencies.
(b) Convert the cumulative frequencies to cumulative percentages and tabulate them.
(c) Plot the cumulative percentage curve.
(d) Find graphically P20 and P60. Show with dashed lines how you found P20.
(e) Find graphically the percentile rank of scores of 195 and 245. Show with dashed lines how you found the percentile rank for 195.