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3 years ago

Which best explains why |–4| = 4?

Mathematics

1 answer:

kodGreya [7K]3 years ago

8 0

Answer:

It's because the little lines around -4 are called absolute value functions, and their function is to make any negative value to positive. If there are a positive value in an absolute value function, it stays positive, for example:

|-2| = 2, and |2| = 2

Hope this helps!

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Answer:

$ME= \frac{69.397-60.128}{2}= 4.6345 \approx 4.635$

And the best answer on this case would be:

b) m = 4.635

Step-by-step explanation:

Let X the random variable of interest and we know that the confidence interval for the population mean $\mu$ is given by this formula:

$\bar X \pm t_{\alpha/2} \frac{s}{\sqrt{n}}$

The confidence level on this case is 0.9 and the significance $\alpha=1-0.9=0.1$

The confidence interval calculated on this case is $60.128 \leq \mu \leq 69.397$

The margin of error for this confidence interval is given by:

$ME =t_{\alpha/2} \frac{s}{\sqrt{n}}$

Since the confidence interval is symmetrical we can estimate the margin of error with the following formula:

$ME = \frac{Upper -Lower}{2}$

Where Upper and Lower represent the bounds for the confidence interval calculated and replacing we got:

$ME= \frac{69.397-60.128}{2}= 4.6345 \approx 4.635$

And the best answer on this case would be:

b) m = 4.635

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hope this helped

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3 years ago

Which best explains why |–4| = 4?​

Which best explains why |–4| = 4?