Compute for the population mean, standard deviation, and the margin of error. Use the formula: E = za and a confidence level of 90%, 95%, and 99%. 5. Compute for the appropriate sample size using the computed values above Use the formula: n = (2) and a confidence level of 90%, 95%, and 99% 6. Interpret your results in the context of your problem statement. 7. How important is sampling in the survey? Is sampling necessary in your survey? Justify your answer. 8. What steps can you suggest in solving the problem stated in your output?