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3 years ago

What is the function rule for the line?

Mathematics

2 answers:

AVprozaik [17]3 years ago

8 0

Answer:

$y=-\frac{2}{3}x-2$

Step-by-step explanation:

To find the equation that represents the line, we just need to use two points on the line and find the slope first.

We are gonna use points (-3,0) and (0,-2). The slope formula is

$m=\frac{y_{2} -y_{1} }{x_{2} -x_{1} } \\m=\frac{-2-0}{0-(-3)}\\m=\frac{-2}{3}$

Then, we use the point-slope formula

$y-y_{1} =m(x-x_{1} )\\y-0=-\frac{2}{3} (x-(-3))\\y=-\frac{2}{3}x-2$

Therefore, the right answer is the third choice.

Anna11 [10]3 years ago

5 0

f(x) = -2/3 - 2

Because it intercepts the y axis at -2 and the rise over run is -2 (going down two) and 3 (going right three)

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Answer:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$

$n=\frac{0.5(1-0.5)}{(\frac{0.03}{1.96})^2}=1067.11$

And rounded up we have that n=1068

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".

The population proportion have the following distribution

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

Solution to the problem

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by:

$z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96$

The margin of error for the proportion interval is given by this formula:

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

And on this case we have that $ME =\pm 0.03$ and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$ (b)

We don't have a prior estimation for the proportion $\hat p$ so we can use 0.5 as an approximation for this case

And replacing into equation (b) the values from part a we got:

$n=\frac{0.5(1-0.5)}{(\frac{0.03}{1.96})^2}=1067.11$

And rounded up we have that n=1068

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Step-by-step explanation:

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Answer:

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Answer:

1. True

2. False.

3. True.

Step-by-step explanation:

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