need explanation or Solution for each answer ASAP THANKS

26. What is a reliable sample size for a study that has 400 target population size and 5% margin of error? A. 100 C. 200 B. 150 D. 250 27. The statement of purpose in a research study should A. describe the study C. identify the intent or objective of the study B. identify the methodology of the study D. specify the type of people to be involved in the study 28. A school has 400 girls and 350 boys. How many girls would you include in your study using statistical sampling if the total sample size is 907 A. 42 C. 50 B. 48 D. 79 29. The computer terminals in a school are labeled I to 300. The technician wants to know if the computers are in good condition by testing 50 of these units. He randomly selects the 12" to be the first unit to be tested. Which computer unit will be tested next? A. 150 C. 17th B. 16 D. 18 30. The feasibility of a research study should be considered in the light of A. cost C. researcher's expertise B. time D. all of the above