The mean test score of a sample of 28 students in a Statistics class is 85, with a standard deviation of 7. a) Construct a 96% confidence interval for the mean test score of Statistics students. Round your answer to 3 decimal places. HI b) What is the margin of error of this interval? The margin of error is c) Interpret your findings. You can be 96% confident that the population mean is somewhere between d) Is the true population mean likely to be an A (90 or more)? 78 and 92 81 and 90 82 and 88 e Textbook and Media 83 and 85A random sample of 945 families selected from a large city showed that 15.3% of them make $100,000 or more per year. Based on this sample, the 99% condence interval for the proportion of all families living in this city who make $100,000 or more per year, rounded to four decimal places, is: the lower endpoint is n the upper endpoint is n