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luda_lava [24]
3 years ago
6

H ELP!!!

Mathematics
2 answers:
REY [17]3 years ago
6 0
Can you please show me a picture of the assignment. Do you have a pic
klemol [59]3 years ago
4 0
De donde está no debes a gente não tem como você me llamo Marta não tem como você me llamo Marta e o que
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Suppose that scores on the mathematics part of a test for eighth-grade students follow a Normal distribution with standard devia
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Answer:

We need an SRS of scores of at least 153.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

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Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.05 = 0.95, so z = 1.645

Now, find M as such

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How large an SRS of scores must you choose?

This is at least n, in which n is found when M = 20, \sigma = 150. So

M = z*\frac{\sigma}{\sqrt{n}}

20 = 1.645*\frac{150}{\sqrt{n}}

20\sqrt{n} = 1.645*150

\sqrt{n} = \frac{1.645*150}{20}

\sqrt{n} = 12.3375

(\sqrt{n})^{2} = (12.3375)^{2}

n = 152.2

Rounding to the next whole number, 153

We need an SRS of scores of at least 153.

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