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You may necd to use the appropeiate appendix table or technology to answer this question. An air transport association surveys business travelers to develop quality ratings for transatiantic gateway airports. The maximum possible rating is 10. Suppose a simple random sample of 50 business travelers is selected and each traveler is asked to provide a rating for a certain airport. The ratings obtained from the sample of 50 business travelers follow. Develop a 95% confidence interval estimate of the population mean rating for this alrport. (Round your answers to two decimal places.) to You may need to use the approprate appendix tabie or technoleor to answer this question. A simple randorn sample of 70 items resulted in a sample mean of 90 . The population standard deviation is =15. (a) Compute the 95% confidence interval for the population mean. (Round your answers to two decimal places.) to (b) Assume that the same sample mean was obtained from a sample of 140 items. Provide a 95% confidence interval for the population mean. (Round your answers to two decimal places.) (c) What is the effect of a larger sample size on the interval cstimate? A langer sample size provides a larger margin of erroc A larger sample size provides a smaller margin of error. A targer sample size does not change the margin of error