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Lisa [10]
3 years ago
13

Need help with question 1

Mathematics
2 answers:
Elodia [21]3 years ago
8 0

Answer:

{x = -1,\, y = -4 \text{ or } (-1, -4)}

Step-by-step explanation:

Sunny_sXe [5.5K]3 years ago
7 0

Answer:

\large \boxed{x = -1,\, y = -4 \text{ or } (-1, -4)}

Step-by-step explanation:

ƒ(x):

-x + y = -3

For easier calculations, add x to each side. Then

y = -3 + x

x =  1:  y = -3 + 1                = -2

x = 0:  y = -3 + 0               = -3

x = -1: y =  -3 + (-1) = -3 - 1 = -4

g(x):

-6x + y = 2

y = 2 + 6x

x =  1: y = 2 + 6(1)              =  8

x = 0: y = 2 + 0(1)              =  2

x = -1: y = 2 + 6(-1) = 2 - 6 = -4

\begin{array}{ccc}\mathbf{x}& \mathbf{f(x)}& \mathbf{g(x)}\\\mathbf{1} & -2 & 8\\\mathbf{0} & -3 & 2\\\mathbf{-1} & -4 & -4\\\end{array}\\\text{The table shows that f(x) = g(x) = -4 when x = -1.}\\\text{The solution to both equations is $\large \boxed{\mathbf{x = -1,\, y = -4} \text{ or } \mathbf{(-1, -4)}}$}

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Answer:

0.41 - 1.96\sqrt{\frac{0.41(1-0.41)}{1000}}=0.380

0.41 + 1.96\sqrt{\frac{0.41(1-0.41)}{1000}}=0.440

The 95% confidence interval would be given by (0.380;0.440)

0.41 - 2.58\sqrt{\frac{0.41(1-0.41)}{1000}}=0.370

0.41 + 2.58\sqrt{\frac{0.41(1-0.41)}{1000}}=0.450

The 99% confidence interval would be given by (0.370;0.450)

Step-by-step explanation:

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 confidence interval for the mean is given by the following formula:  

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

If we replace the values obtained we got:

0.41 - 1.96\sqrt{\frac{0.41(1-0.41)}{1000}}=0.380

0.41 + 1.96\sqrt{\frac{0.41(1-0.41)}{1000}}=0.440

The 95% confidence interval would be given by (0.380;0.440)

And for the 99% confident interval the critical value would be 2.58 and if we replace we got:

0.41 - 2.58\sqrt{\frac{0.41(1-0.41)}{1000}}=0.370

0.41 + 2.58\sqrt{\frac{0.41(1-0.41)}{1000}}=0.450

The 99% confidence interval would be given by (0.370;0.450)

3 0
3 years ago
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