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3 years ago

It’s urgent please help

Mathematics

1 answer:

djverab [1.8K]3 years ago

4 0

Zero: x=0; mult: 1; Eff:Cross
Zero: x= -2; mult: 8; Eff: Bounce
Zero: x= 1/2; mult: 5; Eff: Cross

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Write the equation of the line in fully simplified slope-intercept form?

Inessa05 [86]

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Step-by-step explanation:

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3 years ago

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At 95% confidence, how large a sample should be taken to obtain a margin of error of 0.03 for the estimation of a population pro

Gnom [1K]

Answer:

A sample of 1068 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.

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

In which

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

The margin of error is:

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

95% confidence level

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

At 95% confidence, how large a sample should be taken to obtain a margin of error of 0.03 for the estimation of a population proportion?

We need a sample of n.

n is found when M = 0.03.

We have no prior estimate of $\pi$ , so we use the worst case scenario, which is $\pi = 0.5$

Then

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

$0.03 = 1.96\sqrt{\frac{0.5*0.5}{n}}$

$0.03\sqrt{n} = 1.96*0.5$

$\sqrt{n} = \frac{1.96*0.5}{0.03}$

$(\sqrt{n})^{2} = (\frac{1.96*0.5}{0.03})^{2}$

$n = 1067.11$

Rounding up

A sample of 1068 is needed.

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3 years ago

Please help me I don’t understand this

Vitek1552 [10]

Answer:

14/15

Step-by-step explanation:

9/15+5/15=14/15

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What is the equation of a line that is parallel to y=5/6x-10 and passes through (12,8)

Colt1911 [192]

The equation of a line that is parallel to y=5/6x-10 and passes through the point (12,8) is y=5/6-2.

y=5/6-2

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4 years ago

Factor 4x^2+81 over the set of complex numbers.

Hunter-Best [27]

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