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2. Two different hardening processes, (1) saltwater quenching and (2) oil quenching, are used on samples...

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Mechanical Engineering

2. Two different hardening processes, (1) saltwater quenchingand (2) oil quenching, are used on samples of a particular type ofmetal alloy. The results are shown in the table below. Assume thathardness is normally distributed. Test whether the variances arestatistically different at 90% confidence. (10 pts)

Saltwater Quench

Oil Quench

145

154

150

152

153

149

148

157

141

142

152

148

146

160

154

154

153

145

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