The mean serum cholesterol level in the population of females who do not develop coronary disease is known to be 219mg. You perform an investigation as to whether the mean serum cholesterol levels in females who do develop coronary 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?