A survey of 415 corporate, government, and accounting executives of the Financial Accounting Foundation found that 278 rated cash flow (as opposed to earnings per share, etc.) as the most important indicator of a company's financial health. Assume that these 415 executives constitute a random sample from the population of all executives. Use the data to find a 95% confidence interval for the fraction of all corporate executives who consider cash flow the most important measure of a company's financial health.