lan is a phycologist interested in determining the proportion of algae samples from a local rivulet that belonged to a particular phylum. Without relying on any previous knowledge, lan wanted to estimate the proportion that were cyanobacteria with a margin of error of at most 0.01 in a 98% confidence interval. What is the critical value for 98% confidence level? Have the answer in 3 decimals. How large a sample size would be required?