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Citrus2011 [14]
3 years ago
12

10 points please answer urgent

Mathematics
2 answers:
Nata [24]3 years ago
4 0
Part a. 28 × 4 equals 112. So the anwser is 112

Part b. 28 × 1/2 = 14. So the anwser is 14
Anika [276]3 years ago
3 0

A. 3.5 * 4= 14 cups of flour
B. 3.5 * .5= 1 3/4 cups of milk

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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

So

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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