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IceJOKER [234]
3 years ago
10

Nnnnneeedd help...........................

Mathematics
2 answers:
Vinvika [58]3 years ago
7 0

Answer:

b

Step-by-step explanation:

liraira [26]3 years ago
6 0

Answer:

1.) g(x) = 3(-x)+4

2.) Vertical compression by a factor of 1/3

Step-by-step explanation:

For the first image, "let g(x) be a vertical shift of f(x) = -x up 4 units followed by a vertical stretch factor of 3."

You can stretch or compress an entire graph by multiplying the equation by a constant, <em>C.</em>

If C > 1, it's a stretch.

If 0 < C < 1 , it's a compression.

So anyways, <em>C</em> goes in front of the parent function to transform it.

With the stretch, your equation is now 3(-x)

Then just go up 4 units by adding 4 to the end of your equation,

<em>g(x) = 3(-x)+4</em>, and you're done :)

2.) Referring back to what I said about compressions and stretches, multiplying a constant in front of the entire equation will be a vertical transformation.

if 0 < C < 1 , it's a compression.

1/3 is greater than 0 and less than 1 so it's a compression :)

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Viefleur [7K]
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Confidence Interval Mistakes and Misunderstandings—Suppose that 500 randomly selected recent graduates of a university were as
kvv77 [185]

Answer:

The correct 95% confidence interval is (8.4, 8.8).

Step-by-step explanation:

The information provided is:

n=500\\\bar x=8.6\\\sigma=2.2

(a)

The (1 - <em>α</em>)% confidence interval for population mean (<em>μ</em>) is:

CI=\bar x\pm z_{\alpha/2}\times \frac{\sigma}{\sqrt{n}}

The 95% confidence interval for the average satisfaction score is computed as:

8.6 ± 1.96 (2.2)

This confidence interval is incorrect.

Because the critical value is multiplied directly by the standard deviation.

The correct interval is:

8.6\pm 1.96 (\frac{2.2}{\sqrt{500}})=8.6\pm 0.20=(8.4,\ 8.6)

(b)

The (1 - <em>α</em>)% confidence interval for the parameter implies that there is (1 - <em>α</em>)% confidence or certainty that the true parameter value is contained in the interval.

The 95% confidence interval for the mean rating, (8.4, 8.8) implies that the true there is a 95% confidence that the true parameter value is contained in this interval.

The mistake is that the student concluded that the sample mean is contained in between the interval. This is incorrect because the population is predicted to be contained in the interval.

(c)

The (1 - <em>α</em>)% confidence interval for population parameter implies that there is a (1 - <em>α</em>) probability that the true value of the parameter is included in the interval.

The 95% confidence interval for the mean rating, (8.4, 8.8) implies that the true mean satisfaction score is contained between 8.4 and 8.8 with probability 0.95 or 95%.

Thus, the students is not making any misinterpretation.

(d)

According to the Central Limit Theorem if we have a population with mean <em>μ</em> and standard deviation <em>σ</em> and we take appropriately huge random samples (<em>n</em> ≥ 30) from the population with replacement, then the distribution of the sample mean will be approximately normally distributed.

In this case the sample size is,

<em>n </em>= 500 > 30

Thus, a Normal distribution can be applied to approximate the distribution of the alumni ratings.

7 0
3 years ago
Solve for x round to the nearest tenth of a degree,if necessary.​
Ostrovityanka [42]

Answer:

Solution given:

Cos X=Adjacent/hypotenuse

Cos X=6.5/8.4

x=Cos-¹(6.5/8.4)

<u>x=39.3</u>°

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