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2.What is the 95% confidence interval estimate of the population mean score?n2Annual starting salary for graduates of the BBA program in a Canadian University is expected to be between $45,000 and $65,000. A survey involving a random sample of graduates from this program is planned and the first order of business is to decide on an appropriate sample size. Asusual, the 95% level of confidence will be used. (6 Points)a. What is the planning value for the population standard deviation to be used in the sample size formula for estimating the population mean starting salary?
b. How large should the sample size be if the desired margin of error is $1200?))C. How large should the sample size be if the desired margin of error is $ 800?))1.The proportion of female customers in a recent satisfaction survey of 500 listeners for a Toronto radio station is found to be 0.52. (6 Points)a.Construct a 95% confidence interval for the population proportion of female listeners.