15. Suppose it is known that 40% of employees at a company use a Flexible Spending Account (FSA) benefit. a) If a randoma sample of 300 employees is selected, do we expect that exactly 40% of the sample uses an FSA? Why or why not? b) Find the standard error for samples of size 300 drawn from this population. What adjustements could be made to the sampling method to produce a sample proportion that is more precise