2. (4 points) A researcher would like to estimate that the average of diastolic blood pressure of patients coming to the emergency room in a small town. A sample of 16 patients was selected randomly and their diastolic blood pressure was recorded. Suppose the variable of interest is approximately normally distributed. According to the sample data collected, the average diastolic blood pressure is 97.94 mmHg (millimetres of mercury) and the standard deviation is 12.65 mmHg. a) [1] Define the parameter of interest. b) [3] Construct a 95% confidence interval for the parameter of interest and interpret the interval in the context of the question. (Round to three decimal places)