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prohojiy [21]
2 years ago
12

Solve using elimination. -5x – 7y = -15 --4x – 7y = -19

Mathematics
1 answer:
Sav [38]2 years ago
7 0
-5x+15 = -4x+19
x + 15 = 19
x = 4
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In a sample of 230 teenagers, 202 would like to have smaller class sizes at their school. Find the sample
marishachu [46]

Answer:

The sample proportion is 0.88.

The margin of error is of 0.04.

The interval likely to contain the true population proportion is (0.84,0.92).

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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.

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In which

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Margin of error:

The margin of error is of:

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Sample of 230 teenagers, 202 would like to have smaller class sizes at their school.

This means that n = 230, and that the sample proportion is:

\pi = \frac{202}{230} = 0.88

The sample proportion is 0.88.

Standard 95% confidence level

So \alpha = 0.05, z is the value of Z that has a p-value of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

Margin of error:

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

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The margin of error is of 0.04.

Confidence interval:

Sample proportion plus/minus margin of error. So

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The interval likely to contain the true population proportion is (0.84,0.92).

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2 years ago
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kiruha [24]

Answer:

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Step-by-step explanation:

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