A sample of 55 eggs yields a mean weight of 1.50 ounces. Assuming that = 0.45 ounces, find the margin of error in estimating at the 95% level of confidence. A) 0.02 oz B) 0.40 oz C) 0.12 oz D) 0.10 oz The mean score, x, on an aptitude test for a random sample of 5 students was 73. Assuming that = 15, construct a 95.44% confidence interval for the mean score, , of all students taking the test. A) 43 to 103 B) 59.6 to 86.4 C) 67.0 to 79.0 D) 62.9 to 83.1 A laboratory tested 80 chicken eggs and found that the mean amount of cholesterol was 187 milligrams. Assume that = 10.6 milligrams. Construct a 95% confidence interval for the true mean cholesterol content, , of all such eggs. A) 183.9 to 190.1 milligrams B) 184.7 to 189.3 milligrams 184.2 to 189.8 milligrams D) 185.0 to 189.0 milligrams