The U.S. Department of Health, Education, and Welfare collected sample data for 1555 women aged 18 to 24 years. This sample group has a mean serum cholesterol level (measured in mg/100 ml) of 193.7. Use this sample data to find the 97% confidence interval for the mean serum cholesterol level of all women in the 18- 24 year age bracket, and the margin of error E. Assume that the population standard deviation is 42.0.

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