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2 years ago

Can someone please help! I need this quickly and I’m really struggling!

Mathematics

2 answers:

Scilla [17]2 years ago

8 0

Answer:

x = 4, and y = 3

Step-by-step explanation:

I hope i helped you! :D

GaryK [48]2 years ago

6 0

Answer:

x = 4

y = 3

Step-by-step explanation:

2x - 3(x - 1) = -1

2x - 3x + 3 = -1

-x + 3 = -1

- 3 - 3

(-1) -x = -4 (-1)

x = 4

y = 4 - 1

y = 3

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Find the sample size required to achieve the given margin of error with SD = 51.02 and z - score = 1.96. Round your answer to th

coldgirl [10]

Answer:

The sample size required is 2500.

Step-by-step explanation:

z-score:

In function of the margin of error M, the z-score is given by:

$Z = \frac{M}{\frac{\sigma}{\sqrt{n}}} = \frac{M\sqrt{n}}{\sigma}$

In this question, we have that:

$\sigma = 51.02, M = 2, Z = 1.96$

$Z = \frac{M\sqrt{n}}{\sigma}$

$1.96 = \frac{2\sqrt{n}}{51.02}$

$2\sqrt{n} = 51.02*1.96$

$\sqrt{n} = \frac{51.02*1.96}{2}$

$(\sqrt{n})^2 = (\frac{51.02*1.96}{2})^2$

$n = 2500$

The sample size required is 2500.

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3 years ago

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3 years ago

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不完整的问题，对不起，伙计。

本题已由中国数学会官方解答（现有会员：2人）

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Feet
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second

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