The thicknesses of the six pads designed for employ in aircraft engine mounts were measured. The results, in mm, were 40.93, 41.11, 41.47, 40.96, 40.80, and 41.32.
A.) Can you conclude that the mean thickness is greater than 41 mm?
B.) Can you conclude that the mean thickness is less than 41.4 mm?
C.) The target thickness is 41.2 mm. Can you conclude that the mean thickness differs from the target value?