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Art [367]
3 years ago
15

City A has an elevation of 3447 feet above sea level while city B has an elevation of 86 feet below sea level. How much higher i

s City A than City B?
Mathematics
1 answer:
Rainbow [258]3 years ago
7 0
Add both distances to find the total distance between them: 3447+86=3533 ft.
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Answer:

The sample size required is 2500.

Step-by-step explanation:

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In function of the margin of error M, the z-score is given by:

Z = \frac{M}{\frac{\sigma}{\sqrt{n}}} = \frac{M\sqrt{n}}{\sigma}

In this question, we have that:

\sigma = 51.02, M = 2, Z = 1.96

So

Z = \frac{M\sqrt{n}}{\sigma}

1.96 = \frac{2\sqrt{n}}{51.02}

2\sqrt{n} = 51.02*1.96

\sqrt{n} = \frac{51.02*1.96}{2}

(\sqrt{n})^2 = (\frac{51.02*1.96}{2})^2

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The sample size required is 2500.

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