Use 6.85 days as a planning value for the population standard deviation a. Assuming 95% confidence, what sample size would be required to obtain a margin of error of 1.5 day. Do not found intermediate clausations Round your answer up to the nearest whole number b. Ir the precision statement was made with 90% concernice, whal samples would be require to obtain obradin otetor. 3 days Do not round intermediate calculations. Round your answor up to the near to number