In an effort to determine whether exposure to high lead levels has an effect on blood pressure in young children, blood-pressure measurements were taken on 30 children aged 5-6 years living in a specific community exposed to high lead levels. For these children, the mean diastolic blood pressure was found to be 66.2 mm Hg with standard deviation 7.9 mm Hg. From a nationwide study, we know that the mean diastolic blood pressure is 58.2 mm Hg for 5- to 6-year old children. We will assume that exposure to lead will have either no effect or cause an increase in blood pressure. Determine a one-sided 95% confidence interval for diastolic blood pressure among 5- to 6-year-old children in this community based on the observed 30 children. Based on this confidence interval, does it appear that children who are exposed to lead have higher blood pressure?
