Question

The tensile strength of steel bars produced by a manufacturer has a mean 30MPa and the standard deviation of 1.5 MPa. By a new technique in the manufacturing process, it is claimed that the tensile strength can be improved. To test this clam, a sample of 50 steel bars is tested and it is found that the mean tensile strength is 30.5 MPa. Can we support the claim at 1% level of significance

Answer 1

Answer:

Yes

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