0 Question 18 v A random sample of 12 song lengths (in minutes) on a playlist found: 3: = 230.1, 3 = 13. Build a 80% CI for the population mean length of a song on the playlist. Round all intermediate calculations to two decimals, then construct the Cl and enter Like this: (min,max}. Be sure to use parentheses or you will be marked wrong. Note: if you use a built-in Cl command on a calculatorr'computer, you might get marked wrong due to rounding. Use the formulas given in the textr'notes. a. Since n A random sample of the price {in S} of a hamburger at 30 restaurants in ACME City found: a = $9.913 = $1.45. Build a 90% CI for the population mean price of a hamburger in ACME City. Round all intermediate calculations to two decimals, then construct the Cl and enter like this: (min,max}. Do not include the S sign. Be sure to use parentheses or you will be marked wrong. Note: if you use a built-in Cl command on a calculatorr'computer, you might get marked wrong due to rounding. Use the formulas given in the textr'notes. a. Since n a 30, ""3? We use a Z-interval '53:? We use a T-inte rval '5'} We use 3, not 0' "'3' It is not important that hamburger prices be normally distributed b. The CI is