A Company Produces an Item That Is Supposed to Have

Multiple Choice

A company produces an item that is supposed to have a six centimetre hole punched in the centre.A quality control inspector is concerned that the machine which punches the hole is "out-of-control" (hole is too large or too small) .In an effort to test this, the inspector is going to gather a sample punched by the machine and measure the diameter of the hole.The alternative hypothesis used to statistical test to determine if the machine is out-of-control is

A) the mean diameter is > 6 centimetres.
B) the mean diameter is < 6 centimetres.
C) the mean diameter is = 6 centimetres.
D) the mean diameter is ≠ 6 centimetres.
E) the mean diameter is ≥ 6 centimetres.