Try this: C. Find the length of the confidence in 1. s = 4.5, n = 20, confidence i 2. s = 3.5, n = 25, confidence i 3. s = 2.5, n = 28, confidenceTry this: D. Roun 1. n = 20 2. n = 3 3. n = 9E. Solve this. 1. The school nurse of a c number of students who confidence level, 3 as the sample sizes does he need