Question

1 The tensile Strength of steel bars produced
by a manufacturer has a mean 30 MPa
and the Staridard 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 claim,
tested
a Sample of 50 steel bars is
and it is found
tensile
that the mean
Strength is 30.5 MPa. Can we support
the claim at 0.01 level of significance?
​

Answer 1

1i do not under Stan is question