9)Suppose you have a random sample of size 31 with a mean of 33 and a population standard deviation of 10.7. What is the maximal margin of error associated with a 95% confidence interval for the true population mean? In your calculations, use z = 2. Give your answer as a decimal, to two places

10)Consider a simple poll that is measuring the proportion of citizens that hold a particular political belief. What is a conservative, "worst case scenario" sample size if you want the margin of error to be 2.5%? Sample Size =