In a Harvard School of Public Health (HSPH) survey 10,904 randomly selected U.S. college students to determine how many of them were classified as abstainers from drinking alcoholic beverages (nondrinkers). A researcher constructed a 99% confidence interval and obtained an interval of (0.18331, 0.20278). (a) interpret the confidence Interval. (b) What is the meant by the confidence level of 99%? (c) What is the point estimator that was used to create the interval? (d) What is the margin of error? t. Add file 14. * 12 points The mean weekly earnings of a random sample of 30 construction workers was $759, with a standard deviation of $73, and the mean weekly earnings of a random sample of 38 manufacturing workers was $658, with a standard deviation of $65 a) Construct an 80% confidence interval for the difference between the mean weekly earnings for construction workers and the mean weekly earnings for manufacturing workers. b) Explain what the confidence level mean. c) is it reasonable to say that there is not a significant difference in pay between construction workers and factory workers? Carefully explain your reasoning. t Add file