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Michelle surveys 70 randomly selected students at her large high school and finds that the mean amount of time (in minutes) spent on homework per night is 115 . Given that the population standard deviation is 11.25 minutes, use a z-score of 1.96 to find the following: A. The margin of error for the confidence interval is plus or minus minutes. Round to the nearest tenth. B. The low end of the confidence interval is minutes. C. The high end of the confidence interval is minutes.An online website that tracks gas prices surveys a random sample of 80 gas stations in a state and finds that the mean price of 1 gallon of regular gasoline is $2.65. Given that the population standard deviation is $0.85, use a z-score of 1.65 to find the following: A. The margin of error for the confidence interval is plus or minus dollars. Round to the nearest hundredth. B. The low end of the confidence interval is dollars. C. The high end of the confidence interval is dollars