, 02.12.2019 18:00 robert7248

# Refer to the accompanying data display that results from a sample of airport data speeds in mbps. complete parts​ (a) through​(c) below. tinterval (13.046, 22.15) x = 17.598 sx = 16.01712719 n = 50 a. express the confidence interval in the format that uses the​ "less than" symbol. given that the original listed data use one decimal​ place, round the confidence interval limits accordingly. round to two decimal places as needed. b. identify the best point estimate of μ and the margin of error. c. in constructing the confidence interval estimate of μ​, why is it not necessary to confirm that the sample data appear to be from a population with a normal​distribution? a. because the sample standard deviation is​ known, the normal distribution can be used to construct the confidence interval. b. because the sample is a random​ sample, it can be assumed that the sample mean is from a population with a normal distribution. c. because the population standard deviation is​ known, the normal distribution can be used to construct the confidence interval. d. because the sample size of 50 is greater than​ 30, it can be assumed that the sample mean is from a population with a normal distribution.

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