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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?55000 – 35000/4=5000b.How large should the sample size be if the desired margin of error is $1000?97c.How large should the sample size be if the desired margin of error is $ 500?3858.The proportion of female customers in a recent satisfaction survey of 400 listeners for a Toronto radio station is found to be 0.54. (6 points)(0.4912, 0.588)0.040957(0.4990, 0.5809)Sample size = 1061
9.120 of a random sample of 800 Ontario drivers admitted that in the last month they have used a smart phone while driving. This random sample is considered representative of Ontario drivers. (4 points)a.Construct a 95% confidence interval to estimate the proportion of Ontario drivers whoused a smart phone while driving in the last month.(0.12526,0.17474)b.What is the margin of error of the estimate at the 99% confidence level?0.0325210.In a survey, the planning value for the population proportion is p* = 0.25. How large should the sample size for the survey be if the desired level of confidence is 90% and the desired margin of error is 0.04? (2 points)318 should be the sample size