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A random sample of 12 song lengths (in minutes) on a playlist found:= 235.8, 8 = 16.9. 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 CI 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 calculator/computer, you might get marked wrong due to rounding. Use the formulas given in the text/notes. a. Since n < 30, We use a Z-interval O It is important that song lengths be normally distributed We use s, not o We use a T-interval
To build a 99% CI for the mean of a population, you take a random sample and find these values: ( 18.4 26.7 18.7 22.4 20.9 22.6 23.1 15.8 20.3 21.2 10.1 30.5 16.7 21.3 24.1 15.1 22.6 What is the CI? Enter like this: (min, max) Be sure to use the parentheses or you will be marked wrong. Keep at least 3 decimals in all intermediate steps, and round your answer to two decimals. Submit Question
To build a 90% CI for the mean of a population, you take a random sample and find these values: 21.7 8.4 19.2 18.1 19.2 11.4 25.2 9.4 21 22.3 14.6 19 19.3 16.8 22.8 23.6 22.2 15.3 What is the CI? Enter like this: (min, max) Be sure to use the parentheses or you will be marked wrong. Keep at least 3 decimals in all intermediate steps, and round your answer to two decimals. Submit Question