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iren2701 [21]
3 years ago
5

I need the answers to 1 and 2 please help

Mathematics
1 answer:
Serggg [28]3 years ago
7 0

Answer:

you need to write the article name or a picture of the article to get a correct answer.

Step-by-step explanation:

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A researcher surveyed 220 residents of a city about the number of hours they
olga55 [171]

Answer:

Margin of error of 0.0485 hours.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

That is z with a pvalue of 1 - 0.025 = 0.975, so Z = 1.96.

Now, find the margin of error M as such

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

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\sigma = 0.35, n = 220

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Margin of error of 0.0485 hours.

5 0
3 years ago
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