3. A time study analyst wants to estimate the time required to perform a specific job. A preliminary study yielded a mean of X minutes and a standard deviation of Y minutes. The desired confidence is 95 percent. How many observations will he need (including those already taken) if the expected maximum error is: A. +20 and 20 percent of the sample mean? B. One-half minute? (Use a number in the range shown instead of X and Y : Instead of X, select a number in the range of 5.05 to 5.99 Instead of Y, select a number in the range of 1.05 to 1.99)