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3 years ago

12

The difference between number 20 and its opposite is what percentage of 200? (if you do not remember: opposite of 15 is −15; opp

osite of −7 is 7.) Answer:

2 answers:

True [87]3 years ago

8 0

20%

This is because 20 and it's opposite -20 is 40. (20 - -20 = 40). Then 40 is 20% of 200.

Fed [463]3 years ago

4 0

Answer:

20%

Step-by-step explanation:

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9. Gabriel is solving 23 x 12. He already multiplied the ones, 2 x 3 = 6. What two digits should he multiply next? How do you kn

Hitman42 [59]

Answer:

20 x 10

Step-by-step explanation:

because these are the remaining digits :D

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2 years ago

A government report gives a 99% confidence interval for the proportion of welfare recipients who have been receiving welfare ben

juin [17]

Answer:

The estimation for the proportion for this case is $\hat p = 0.21$

And we know that the 99% confidence interval is given by:

$0.21 \pm 0.045$

So then the margin of error at 99% of confidence is 0.045, and the margin of error is given by this formula:

$ME= z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}$

If we decrease the confidence level this margin of error can't be higher than 0.045 so then the correct answer for this case would be:

d. 21% ± 4.8%

Because if the z value decrease from 2.58 to 1.96 not makes sense that the margin of error increase from 0.045(4.5%) to 0.048(4.8%)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Solution to the problem

The population proportion have the following distribution

$p \sim N(p,\sqrt{\frac{\hat p(1-\hat p)}{n}})$

The confidence interval would be given by this formula

$\hat p \pm z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}$

For the 95% confidence interval the value of $\alpha=1-0.95=0.05$ and $\alpha/2=0.025$ , with that value we can find the quantile required for the interval in the normal standard distribution.

$z_{\alpha/2}=1.96$

For the 99% confidence interval the value of $\alpha=1-0.99=0.01$ and $\alpha/2=0.005$ , with that value we can find the quantile required for the interval in the normal standard distribution.

$z_{\alpha/2}=2.58$

The estimation for the proportion for this case is $\hat p = 0.21$

And we know that the 99% confidence interval is given by:

$0.21 \pm 0.045$

So then the margin of error at 99% of confidence is 0.045, and the margin of error is given by this formula:

$ME= z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}$

If we decrease the confidence level this margin of error can't be higher than 0.045 so then the correct answer for this case would be:

d. 21% ± 4.8%

Because if the z value decrease from 2.58 to 1.96 not makes sense that the margin of error increase from 0.045(4.5%) to 0.048(4.8%)

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3 years ago

At 8am the temperature was 56°F by noon a storm had arrived and the temperature was 43°F which describes the change in the tempe

GaryK [48]

Answer:

b. -13

Step-by-step explanation:

The change in temperature will be the original temperature plus or minus x, the change between a temp and b temp, to equal what the temperature is now.

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3 years ago

Read 2 more answers

What is the slope of the line that passes through the points (−6,8) and (−9,7)? Write your answer in simplest form.

In-s [12.5K]

Answer:

Slope = $\frac{1}{3}$

Please Mark Brainliest If This Helped!

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1 year ago

Which three-dimensional object has the same shape for parallel, perpendicular, and diagonal cross sections?

GuDViN [60]

This answer would be a cuboid because it has parallel,perpendicular,and diagonal cross sections

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2 years ago