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omeli [17]
3 years ago
6

How many atoms in something determines it

Mathematics
1 answer:
Citrus2011 [14]3 years ago
7 0
The chemical formula for water is H2<span>O which means that every </span>molecule<span> of water has 2 </span>atoms<span> of hydrogen (H) and one </span>atom<span> of oxygen (O). Here comes the key part. From the Periodic Table of Elements, one sees that one mole of hydrogen </span>atoms weighs <span>1 gram while one mole of oxygen </span>atoms<span> weighs 16 grams.</span>
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Is this correct ? Help
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The number of hours that a nine month old baby sleeps at night are normally distributed with a population standard deviation of
finlep [7]

Answer:

The margin of error for a confidence interval for the population mean with a 90% confidence level is 0.53 hours.

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 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.

In this quesstion:

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So

M = 1.645*\frac{1.5}{\sqrt{22}} = 0.53

The margin of error for a confidence interval for the population mean with a 90% confidence level is 0.53 hours.

4 0
3 years ago
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sergij07 [2.7K]
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