Question

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. Mbps <u< Mbps (Round to two decimal places as needed.) b. Identify the best point estimate of u and the margin of error. The point estimate of His Mbps. (Round to two decimal places as needed.) The margin of error is E= Mbps. (Round to two decimal places as needed.) c. In constructing the confidence interval estimate of from a population with a normal distribution? why is it not necessary to confirm that the sample data appear to be O A. Because the sample is a random sample, the distribution of sample means can be treated as a normal distribution O B. Because the sample standard deviation is known, the normal distribution can be used to construct the confidence interval OC. Because the population standard deviation is known, the normal distribution can be used to construct the confidence interval.

Answer 1

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we have Interval ( 13.046, 22:15) 17.598 Sx= 16.017) na 50 13.046 Mbps < l< 22.15 mbps b) point estimate of Mo is 8=19.598 margina of error = 16+ Db 2 13.046+22015 = 17.598 Because the population is known , the normal used to construct the standard deviation distribution can be confidence interval