1)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?

2)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?