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2 years ago

13

What is the answer to 3+2(2+1)

2 answers:

ra1l [238]2 years ago

5 0

answer:

9 po

explanation:

:)

Luba_88 [7]2 years ago

3 0

Answer:

$3+2\left(2+1\right)$

$(2+1)=3$

$3+2\times \:3$

$3+6$

$9$

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Vladimir [108]

Answer:

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Step-by-step explanation:

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by:

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The margin of error for the proportion interval is given by this formula:

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And on this case we have that $ME =\pm 0.05$ and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$ (b)

The estimated proportion for this case is $\hat p=0.5$ . And replacing into equation (b) the values from part a we got:

$n=\frac{0.5(1-0.5)}{(\frac{0.05}{1.96})^2}=384.16$

And rounded up we have that n=385

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