11}. Suppose you are trying to estimate the population mean for quarterly net income at your company. You have sampled 43 months and you calculated the average net income to be $900 million, with a standard deviation of $84 million. Note that this standard deviation is of raw data. Your company has been in business for 50 years (quite a long time, think how many months that isl}. Please calculate a confidence interval for your sample mean. assuming you wish to be 91% confident. Hint: Consider the use of FPCF? Maybe not, but consider. 11. Use the information in Problem #10. but now you have sampled only 21 months. Assume your standard deviation is of sample mean data. Be 33% confident in your confidence interval calculation. Hint: FPCF used here