Shape memory alloys can undergo a reversible phase transformation. These materials display dramatic shape memory temperature-induced deformations that are recoverable. Investigators want to evaluate the influence of two factors Factor \(A\) : Temperature at levels \(350^{\circ} \mathrm{C}\) and \(450^{\circ} \mathrm{C}\)

Factor \(B\) : Time at levels \(1 \mathrm{~h}\) and \(5 \mathrm{~h}\).

on the phase transformation temperature.

Given the following observations:

(a) Attach the sample means at the corners of a square. Comment on any obvious pattern.

(b) Obtain the point estimates of the effects and \(95 \%\) confidence intervals.

Factor A Factor B Rep. I Rep. 2 31.7 31.3 33.5 33.1 33.9 34.5 1 1 38.8 39.6