An engineer who is studying the tensile strength of a steel alloy intended for use in golf club shafts knows that tensile strength is approximately normally distributed with a standard deviation of 60...

An engineer who is studying the tensile strength of a steel alloy intended for use in golf club shafts knows that tensile strength is approximately normally distributed with a standard deviation of 60 psi. A random sample of 12 specimens has a mean tensile strength of 3,250 psi. Test the hypothesis that the mean strength is 3,250 psi. Use a 0.05 significance level. Null and Alternative Hypothesis is?