can someone please help me out with this problem

antitative Methods for Pub Health Application Module 1 Quiz An investigator wants to assess whether the use of a specific medication given to infants born prematurely is associated with hydrocephaly (fluid on the brain). Eighty infants who were given the medication and eighty comparison infants who were also born prematurely but not given the medication will be selected for the analysis. Each infant will undergo extensive testing at age 2 for various aspects of development. Identify the type of study proposed and indicate its specific strengths and weaknesses. A study is planned to assess the effect of a new surgical intervention for kidney stones. One hundred-fourteen patients with kidney stones will be randomly assigned to receive either the new surgical intervention or the standard surgical intervention. The efficacy of the new surgical intervention will be measured by the time is takes a patient to return to normal activities, measured in days. Identify the type of study proposed and indicate its specific strengths and weaknesses. An investigator wants to assess whether increased levels of pesticide exposure is a risk factor for colon cancer. Electronic medical records at a local hospital will be used to identify 74 patients with colon cancer. One hundred eleven patients who are similar but free of colon cancer will al be selected. Each participant's medical record will be analyzed for pesticide exposure history. Identify the type of study proposed and indicate its specific strengths and weaknesses. Describe the most likely source of bias in the study described in Problem 3