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4 years ago

Answer the question in the image

Mathematics

1 answer:

Vlad1618 [11]4 years ago

4 0

X=9

Y=3

Look at the picture to see what I did

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The Student Monitor surveys 1200 undergraduates from 100 colleges semiannually to understand trends among college students. Rece

nlexa [21]

Answer:

A sample size of 385 is needed.

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:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

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

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

Now, find the margin of error 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.

You feel that a reasonable estimate of the standard deviation is 10.0 hours.

This means that $\sigma = 10$

What sample size is needed so that the expected margin of error of your estimate is not larger than one hour for 95% confidence?

A sample size of n is needed. n is found when M = 1. So

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

$1 = 1.96\frac{10}{\sqrt{n}}$

$\sqrt{n} = 1.96*10$

$(\sqrt{n})^2 = (1.96*10)^2$

$n = 384.16$

Rounding up:

A sample size of 385 is needed.

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3 years ago

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NARA [144]

Answer:

5 5/6

Step-by-step explanation:

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4 years ago

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Specific scenarios such as strong evidence stars an inductive argument . It is completed with a conclusion (likely to be true). It is a logical reasoning that allows a conclusion to be untrue. It is called a "valid guess".

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3 years ago

Zeros of (3-2x) is _

Lady_Fox [76]

Answer:

$let \: 3 - 2x = f(x) \\ we \: want \: find \: f(0) \\ then \: 3 - 2x = 0 \\ 3 = 2x \\ x = \frac{3}{2} \\ thank \: you$

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3 years ago

Which regular polygon can be drawn using rotations?

Lena [83]

<span>11-gon hope this helps ;)
</span>

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4 years ago

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