2 21. Which situation represents a proportional relationship?
О
The cost of purchasing sour patch kids candy for $7.00 per pound
with a coupon for $1.00 off the total
0
The cost of purchasing gummy bears for $6.99 per bag plus a
delivery charge of $5.00
0
The cost of purchasing chocolate covered cherries for $6.25 per
pound plus a shipping fee of $2.00 per pound
0
O
The cost of purchasing a basket of chocolate snowmen for $2.50
per pound plus $12.00 for the basket
O
CLEAR ALL

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.