An article in Computers & Electrical Engineering ["Parallel Simulation of Cellular Neural Networks" (1996, Vol. 22, pp. 61-84)] considered the speed-up of cellular neural networks (CNN) for a parallel general-purpose computing architecture based on six transputers in different areas. The data follow: 3.775302 3.350679 4.217981 4.030324 4.639692 4.139665 4.395575 4.824257 4.268119 4.584193 4.930027 4.315973 4.600101

(a) Is there evidence to support the assumption that speed-up of CNN is normally distributed? Include a graphical dis- play in your answer.

(b) Construct a 95% two-sided confidence interval on the mean speed-up

(c) Construct a 95% lower confidence bound on the mean speed-up.