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wlad13 [49]
3 years ago
6

15.12 State SAT scores. The correlation between the average SAT Mathematics score in the states and the percent of high school s

eniors who take the SAT is
r

=

−0.89

r=−0.89

.

(a) The correlation is negative. What does that tell us?

(b) How well does proportion taking predict average score? (Use

r

2

r2

in your answer.)
Mathematics
1 answer:
NikAS [45]3 years ago
8 0

Answer:Answer: A negative correlation shows the relationship between two variables.

Step-by-step explanation: A) the correlation between the average SAT scores and percentage of high school seniors r = - 0.89 shows that the direction is negative and the relationship is strong.

B) SAT score = (-0.89 * proportion taking) + average score

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Answer:

4xy See image.

Step-by-step explanation:

Remember for division questions to use Keep, Change, Flip. You will Keep the first term the same. Change the divide to times. And Flip the second term (turn it upside down, in math this is called the reciprocal)

Also, you need to know when you you get to the part where everything is times, then you times: top×top, and bottom×bottom.

Once everything is times, you can rearrange the order and cancel (cancel is not really the mathy thing happening, you are dividing---

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2 years ago
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4 years ago
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Nookie1986 [14]

Step-by-step explanation:

\lim_{n \to \infty} \sum\limits_{k=1}^{n}f(x_{k}) \Delta x = \int\limits^a_b {f(x)} \, dx \\where\ \Delta x = \frac{b-a}{n} \ and\ x_{k}=a+\Delta x \times k

In this case we have:

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So the integral is:

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To evaluate the integral, we write the radical as an exponent.

∫₁⁴ x^½ dx

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= ⅔ (8) + C − ⅔ − C

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If ∫₁⁴ f(x) dx = e⁴ − e, then:

∫₁⁴ (2f(x) − 1) dx

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∫ sec²(x/k) dx

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Setting this equal to k:

k tan(π/(2k)) = k

tan(π/(2k)) = 1

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4 years ago
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kolbaska11 [484]
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