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Question 5 Not yet The monthly earnings of a group of business students are normally distributed with a standard answered deviation of 545 dollars. A researcher wants to estimate the mean monthly earnings of all business Marked out of students. Find the sample size needed to have a confidence level of 95% and a margin of error of 128 5.00 dollars. F Flag question O a. 2 O b. 5 O c. 61 Old 70 A random sample of 17 hotels in Boston had an average nightly room rate of $165.40 with a sample standard deviation of $21.70. The margin of error for a 95% confidence interval around this sample mean eted IS ked out of O a 11.16 stion Ob 9.36 O c. 710 Od 874 Scores on a certain test are normally distributed with a variance of 68. A researcher wishes to estimate the mean score achieved by all adults on the test. Find the sample size needed to assure with 95% Jut of confidence that the sample mean will not differ from the population mean by more than 4 units. Oa 8 O b. 66 O c. 17 Od n11 tion 8 A sample of 62 eggs yields a mean weight of 1.25 ounces, Assume that population standard deviation is vered 0.31 ounces, find the margin of error in estimating at the 87% level of confidence ked out of Lag O a. 0.06 ation O b. 0.058 c 0.056 Od 0.062