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2 years ago

Which equation is equivalent to 4.5 = 2a? a = 2.5 a = 2.25 4.5a = 2 a + 2 = 4.5

Mathematics

2 answers:

yulyashka [42]2 years ago

5 0

2,25 well ya because a 4,5 divided by 2 equal 2,25

vitfil [10]2 years ago

3 0

The answer to your question is a = 2.25

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The 90% confidence interval for pis (0.7342, 0.8658).

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 zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

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90% confidence level

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The lower limit of this interval is:

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The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.8 + 1.645\sqrt{\frac{0.8*0.2}{100}} = 0.8658$

The 90% confidence interval for pis (0.7342, 0.8658).

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