Natalie puts down $800 on a car. natalie still owes 90% of the purchase price. what was the price she bought the car for? (round to the nearest hundredth or hundredth percent as needed.) a. $12,000 b. $8,000 c. $720 d. $6,000

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.