Finding Confidence Intervals. In Exercises 1–4, use the given confidence level and sample data to find a confidence interval for the population standard deviation ??. In each case, assume that a simple random sample has been selected from a population that has a normal distribution.1. SAT Scores of College Students 95% confidence; n = 30, = 1533, s = 3332. Speeds of Drivers Ticketed in a 65 mi h Zone on the Massachusetts Turnpike 95% confidence; n = 25, = 81.0 mi/h, s = 2.3 mi/h.3. White Blood Cell Count (in Cells per Microliter) 99% confidence; n = 7, = 7.106, s = 2.0194. Reaction Times of NASCAR Drivers 99% confidence; n = 8, = 1.24 sec, s = 0.12 sec.
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