You may need to use the appropriate appendix table or technology to answer this question. A random sample of 89 airline pilots recruited by an airline service had an average yearly income of $99,200 with a standard deviation of $11,000. (a) If we want to determine a 95% confidence interval for the average yearly income of the population, what is the value of t? (Round your answer to three decimal places.) (b) Develop a 95% condence interval for the average yearly income of all pilots (in dollars). (Round your answers to the nearest dollar.) $Em$E