In order to improve the health care delivery system in a primary hospital, a systematic procedure for monitoring and reporting of adverse drug interactions was conducted in the inpatient setting. One of the inputs in this study was the number of drugs administered to the patients. The investigator took a random sample of 115 patients from a list of all patients ever admitted to the hospital within a five- month period and the number of drugs prescribed per admission was determined for each. The average drugs per case was found to be 10.8.

a. What is being estimated?

b. What is the point estimate?

c. If the investigator computed a standard deviation of 1.13,

calculate and interpret a 98% confidence interval for

80% confidence interval for

d. What is the interpretation of each?