Adley is a stingy donor. She originally donated $164 to Forest High School for its libray, but she cant stand a certain book series. Every time she sees a child reading a book from this series she will take back $9 from her donation. The following sequence shows how her donation decreases for each student she sees reading this book series: 164, 155, 146, 137, 128, 119, ... Which representations model this problem situation?

Arandom sample of 15 observations is used to estimate the population mean. the sample mean and the standard deviation are calculated as 172 and 63, respectively. assume that the population is normally distributed. a. with 99 confidence, what is the margin of error for the estimation of the population mean? b. construct the 99% confidence interval for the population mean. c. construct the 95% confidence interval for the population mean. d. construct the 83% confidence interval for the population mean. hint: you need to use excel function =t.inv.2t to find the value of t for the interval calculation.