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3 years ago

B 280 D C What is the measure of angle ADB? A. 17°

Mathematics

1 answer:

loris [4]3 years ago

6 0

Answer:

C. 62

Step-by-step explanation:

ADC is 90 degrees. 90 - 28 = 62

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How long, in minutes, does it take to cover 24 miles at a rate of 12 miles per hour?

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Step-by-step explanation:

Total sales:

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In a clinical test with 2161 subjects, 1214 showed improvement from the treatment. Find the margin of error for the 95% confiden

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Answer:

The margin of error for the 95% confidence interval used to estimate the population proportion is of 0.0209.

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.

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

In which

z is the z-score that has a p-value of $1 - \frac{\alpha}{2}$ .

The margin of error is of:

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

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This means that $n = 2161, \pi = \frac{1214}{2161} = 0.5618$

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 $Z = 1.96$ .

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

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The margin of error for the 95% confidence interval used to estimate the population proportion is of 0.0209.

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3 years ago