I've got 2 questions that I'd appreciate some help with. I will grant a medal to those who help.

I've got 2 questions that I'd appreciate some help with. I will grant a medal to those who help.

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In a sample of 100 households, the mean number of hours spent on social networking sites during the month of January was 50 hours. In a much larger study, the standard deviation was determined to be 6 hours. Assume the population standard deviation is the same. What is the 98% confidence interval for the mean hours devoted to social networking in January?

and Two studies were completed in Florida. One study in northern Florida involved 2,000 patients; 64% of them experienced flu-like symptoms during the month of December. The other study, in southern Florida, involved 3,000 patients; 54% of them experienced flu-like symptoms during the same month. Which study has the smallest margin of error for a 95% confidence interval?

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