The mean serum cholesterol level in the population of females whodo notdevelop coronary disease is known to be 219mg. You perform an investigation as to whether the mean serum cholesterol levels in females whodo developcoronary heart disease is higher than that of the disease-free population. In a sample of 28 females who have coronary disease, the sample mean serum cholest. level is xbar = 232 mg with a sample st. dev. of 38mg. At the .1 level of significance, perform the appropriate test.

Ok so the wording throws me off

are these correct?

Hnull: mu = 219

Ha: mu > 219

Also how do I go about finding the critical value, I got 1.703, but can someone tell me if that is correct or not?

Thank you!