Instruction: Please read and answer the following questions carefully. Write your complete solution. 1. A medical researcher is currently working on the possible impact of the pandemic to Rizal...

Extracted text: Instruction: Please read and answer the following questions carefully. Write your complete solution. 1. A medical researcher is currently working on the possible impact of the pandemic to Rizal Technological University (RTU) students' mental health. He wants to know the minimum number of samples he can consider if the total number of RTU students for the Academic Year 2021-2022 is 3,500 and the margin of error is at 5%. 2. The XYZ research firm is interested in studying the financial behavior of returning OFWS in the entire country. They will use 10% margin of error and 60% proportion of success. 3. Given that NCR target population of 12,877,253 is already 80% fully vaccinated, the Department of Health (DOH) would like to commence their research on the long-time effects of the different COVID-19 vaccines to vaccinated individuals. Compute for the minimum sample size given a 99% confidence level.