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3 years ago

3. Living things can weather and erode the Earth. Which statement is true? m

2 answers:

7 0

The correct answer is the first option, secrete chemicals which cause chemical changes in rocks and cause chemical weathering

erastova [34]3 years ago

4 0

Answer:

Step-by-step explanation:

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541 less than the product of 64 and a number is -803.

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3 years ago

Sandy plays tennis once every 6 six days. Jim plays once every 8 eight days. If

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What is the answer to y=2/3x+4

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3 years ago

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:

$\alpha = \frac{1-0.9}{2} = 0.05$

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

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

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

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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3 years ago

Need answer!! please help.

defon

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I think A

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