From a survey of coworkers you find that 60% of 140 have already received this year's flu vaccine. An approximate 95% confidence interval is (0.519, 0.681). a) How would the confidence interval change if the sample size had been 2240 instead of 140? b) How would the confidence interval change if the confidence level had been 99% instead of 95%? c) How would the confidence interval change if the confidence level had been 90% instead of 95%