# Refer to the accompanying data display that results from a sample of airport dat

Annette Arroyo 2021-09-30 Answered

Refer to the accompanying data display that results from a sample of airport data speeds in Mbps. Complete parts (a) through (c) below.
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 intervals limits accordingly.
$$\displaystyle{13.05}{M}{b}{p}{s}{<}\mu{<}{22.15}$$ Mbps
b. Identify the best point estimate of $$\displaystyle\mu$$ and the margin of error.
The point estimate of $$\displaystyle\mu$$ is 17.60 Mbps.
The margin of error is $$\displaystyle{E}=?$$ Mbps.

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Step 1
Given data,
Lower limit $$\displaystyle={13.05}$$
Upper limit $$\displaystyle={22.15}$$
Point estimate $$\displaystyle{x}={17.60}$$
$$\displaystyle{E}=?$$
Step 2
$$\displaystyle{E}={\frac{{{U}{L}-{L}{L}}}{{{2}}}}$$
$$\displaystyle={\frac{{{22.15}-{13.05}}}{{{2}}}}$$
$$\displaystyle{E}={4.55}$$