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2 years ago

Can someone plz help me with this one problem!!!

Mathematics

1 answer:

barxatty [35]2 years ago

6 0

Answer:

The answer is no.

............

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You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estim

pogonyaev

Answer:

$n=\frac{0.5(1-0.5)}{(\frac{0.025}{1.28})^2}=655.36$

And rounded up we have that n=656

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 80% of confidence, our significance level would be given by $\alpha=1-0.80=0.20$ and $\alpha/2 =0.10$ . And the critical value would be given by:

$z_{\alpha/2}=\pm 1.28$

Solution to the problem

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

$ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$ (a)

Since we don't have prior info for the proportion of interest we can use $\hat p=0.5$ as estimator. And on this case we have that $ME =\pm 0.025$ 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)

And replacing into equation (b) the values from part a we got:

$n=\frac{0.5(1-0.5)}{(\frac{0.025}{1.28})^2}=655.36$

And rounded up we have that n=656

5 0

3 years ago

The product of a positive number and 2 more than that number is 63 find the numbers

Kobotan [32]

I really don't know how toowrk it out on paper, I'm afraid. I just looked at it, and somehow knew that the answers are 7 and 9.

6 0

3 years ago

29. and 30. Please help! ;-;

sweet-ann [11.9K]

I hope this helps you

8 0

3 years ago

Please help! Give explanation

Vera_Pavlovna [14]

A. These angles are not adjacent because they do not share a common line, ray, or segment. They only have point V in common. Note how V is the only letter to show up in the sequences NVP and UVF.

B. These segments are adjacent. We can tell by visually noticing that NVT and TVU share the ray VT. Without the drawing, we can tell they are adjacent because NVT and TVU both have "VT" in them (the order of V and T doesn't matter). See the diagram below.

C. These angles are not adjacent for similar reasoning as choice A above.

D. Same story as choice C and choice A. These angles are not adjacent.

E. Since B is true, this rules out choice E.

==============================

<h3>Final Answer: Choice B</h3><h3>NVT and TVU are adjacent angles.</h3>