Sarah buys a caravan. the cost of the caravan is £15600 plus vat at 20%. Sarah pays a deposit of £5000 she pays the rest of rest of the cost in 10 equal payments. work out the amount of each of the 10 payments.

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.