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Mathematics, 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‚Äč (a) through‚Äč(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‚Äč "less than" symbol. given that the original listed data use one decimal‚Äč place, round the confidence interval limits accordingly. round to two decimal places as needed.

b. identify the best point estimate of őľ and the margin of error.

c. in constructing the confidence interval estimate of őľ‚Äč, why is it not necessary to confirm that the sample data appear to be from a population with a normal‚Äčdistribution?

a. because the sample standard deviation is‚Äč known, the normal distribution can be used to construct the confidence interval.

b. because the sample is a random‚Äč sample, it can be assumed that the sample mean is from a population with a normal distribution.

c. because the population standard deviation is‚Äč known, the normal distribution can be used to construct the confidence interval.

d. because the sample size of 50 is greater than‚Äč 30, it can be assumed that the sample mean is from a population with a normal distribution.

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