The data table below shows the wall thickness (in ins) of cast aluminum cylinder heads used in aircraft engine cooling jackets, taken from Mee (1990)5.
0.223 0.228 0.214 0.193 0.223 0.213 0.218 0.215 0.233
0.201 0.223 0.224 0.231 0.237 0.217 0.204 0.226 0.219
If the manufacturing process is designed to produce cylinder heads whose wall thicknesses follow a normal distribution with mean wall thickness of 0.22 ins and standard deviation 0.01 ins, con?rm or refute the claim that the process was op- erating as designed when the samples shown in the table were obtained. State any assumptions you may need to make in answering this question and keep in mind that there aretwo separate parameters in the postulated process characteristics.