Over a two year period, 34 Eurpean women with previous gestational diabetes were recruited for a study related to fasting nonesterfied fatty acid concentreation (NEFA) measured in micromoles per liter. In this sample the mean NEFA was 435 with a standard deviation of 215. construct a 95% confidence intercal estimate of the mean fasting NEFA level for a population of women with gestational diabetes.