An envelope contains small strips of paper of equal size and shape. Four of the strips have the number 4 written on them, five of the strips have the number 5 written on them, and three of the strips have the number 3 written on them. What is the probability of randomly pulling a strip with the number 4 written on it followed by pulling a strip with the number 3 written on it?

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.