I need help on finals plsssssss

Three forces with magnitudes 300 Newtons, 180 Newtons, and 250 Newtons act on an object at angles −30◦ , 45◦ , and 135◦ with the

inn [45]

Answer:

261∠36° Newtons

Step-by-step explanation:

A straightforward way to find the resultant is to add the x- and y-components of the forces:

r = 300(cos(-30°), sin(-30°)) +180(cos(45°), sin(45°)) +250(cos(135°), sin(135°))

= (300√3/2 +180√2/2 -250√2/2, -300/2 +180√2/2 +250√2/2)

= (150√3 -35√2, -150 +215√2)

≈ (210.310, 154.056)

≈ 260.698∠36.22°

The resultant is approximately 261 Newtons at an angle of 36°.

_____

From components (x, y), the angle is found as arctan(y/x). The magnitude is found as √(x²+y²).

4 0

4 years ago

A New York Times/CBS News Poll asked a random sample of U.S. adults the question, "Do you favor an amendment to the Constitution

AnnZ [28]

Answer:

$p_v =P(z>-0.436)=0.669$

So the p value obtained was a very high value and using the significance level assumed $\alpha=0.05$ we have $p_v>\alpha$ so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can said that at 5% of significance the proportion of interest is NOT significantly higher than 2/3.

We got the same conclusion just looking the confidence interval since our interval contains the value 2/3=0.667 we have enough evidence to fail to reject the null hypothesis on this case.

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

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

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:

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

For this case we can get an estimation for $\hat p$ like this:

$\hat p= \frac{0.63+0.69}{2}=0.66$

And the margin of error would be:

$ME= \frac{0.69-0.63}{2}=0.03$

And we can estimate the standard error since $ME= z SE$

$SE = \frac{0.03}{1.96}=0.0153$

We need to conduct a hypothesis in order to test the claim that the proportion is higher than 2/3 or not:

Null hypothesis: $p \leq \frac{2}{3}$

Alternative hypothesis: $p > \frac{2}{3}$

When we conduct a proportion test we need to use the z statistic, and the is given by:

$z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}}$ (1)

The One-Sample Proportion Test is used to assess whether a population proportion $\hat p$ is significantly different from a hypothesized value $p_o$ .

Calculate the statistic

Since we have all the info requires we can replace in formula (1) like this:

$z=\frac{0.66 -\frac{2}{3}}{0.0153}=-0.436$

Statistical decision

It's important to refresh the p value method or p value approach . "This method is about determining "likely" or "unlikely" by determining the probability assuming the null hypothesis were true of observing a more extreme test statistic in the direction of the alternative hypothesis than the one observed". Or in other words is just a method to have an statistical decision to fail to reject or reject the null hypothesis.

The significance level assumed is $\alpha=0.05$ . The next step would be calculate the p value for this test.

Since is a right tailed test the p value would be:

$p_v =P(z>-0.436)=0.669$

So the p value obtained was a very high value and using the significance level assumed $\alpha=0.05$ we have $p_v>\alpha$ so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can said that at 5% of significance the proportion of interest is NOT significantly higher than 2/3.

We got the same conclusion just looking the confidence interval since our interval contains the value 2/3=0.667 we have enough evidence to fail to reject the null hypothesis on this case.

8 0

4 years ago

A total of 376 tickets were sold for the school play. They were either adult tickets or student tickets. There were 74 fewer stu

Sphinxa [80]

Answer:225 tickets

Step-by-step explanation:

Adult tickets = A

Student ticket = (A - 74)

A + A - 74 = 376

2A = 450

A - 225

7 0

3 years ago

A function f (x)=-8x^2. What is f (-3)?

Sveta_85 [38]

F(x)= -8x²

f(-3)= -8* (-3)²

f(-3)= -8 * 9

f(-3)= -72

8 0

4 years ago

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Given the functions f(x) = −2x − 1 and g(x) = −3x + 4, which operation results in the smallest coefficient on the x term?

docker41 [41]

There are 3 different operations we can perform. Addition, Subtractions and Multiplication.

Subtraction
(−2x − 1) - (−3x + 4)
x - 5
x coefficient = 1

Addition:
(−2x − 1) + (−3x + 4)
3 - 5x
x coefficient = -5

Multiplication:
x(6x - 5) -4
x coefficient = 6

-5 is the least so addition is the answer

3 0

3 years ago

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