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Alik [6]
3 years ago
11

Simplify the ratio 15/18

Mathematics
1 answer:
ElenaW [278]3 years ago
4 0
Very easy. 15 and 18 are the factors of 3 so divide the numerator and denominator by 18. So you will get 5/6 that is it.
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A sample of 997 is needed.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

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M = z\sqrt{\frac{\pi(1-\pi)}{n}}

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98% confidence level

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How large a sample is needed in order to be 98% confident that the sample proportion will not differ from the true proportion by more than 2%?

This is n for which M = 0.02. So

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A sample of 997 is needed.

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3 years ago
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