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Kobotan [32]
3 years ago
8

An observational study found that the amount of time a child spends learning a second language is associated with standardized t

esting performance. The correlation coefficient was found to be r = 0.94. A conclusion was made that the more time a child spends learning a second language, the better the child performs on standardized tests. Why is such a conclusion not correct? (2 points)
The sample was not representative of the population.

The correlation value should be negative for such a conclusion.

The correlation value should equal 0 for such a conclusion.

Causation cannot be determined from an observational study.

The correlation value implies that less than 90% of the variability in standardized testing performance can be explained by learning a second language.
Mathematics
1 answer:
stepan [7]3 years ago
4 0

Answer: the answer is that causation cannot be determined from an observational study.

Step-by-step explanation:

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allsm [11]

Answer:

-31 (perhaps if I 100% knew what I was doing, but this is what I believe the answer should look like based on my research which consisted of me finding out the mechanics of such expressions from a website I found online)

Step-by-step explanation:

I have never had to solve a question like this, so my answer is to be taken with a grain of salt (bucket full).

When we see that funky symbol over there, we're going to want to do some funky things:

6

∑(-2k + 5)

k=3

So we'll substitute 3 for k, as seen here:

(-2(3) + 5)

But wait! We still got that 6, so we'll throw that in with the 3:

(-2(3 · 6) + 5)

From here, we PEMDAS or whatever you prefer until we're done!

(-2(18) + 5)

(-36 + 5)

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[Processing ends successfully.. Just kidding, I ain't no robot!]

6 0
3 years ago
Find the value of this expression if x = 5
vfiekz [6]

Answer:

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Step-by-step explanation:

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8 0
3 years ago
Read 2 more answers
How would -35.64 be classified
grigory [225]

If you mean classifying numbers, then I think -35.64 will be a real, rational number

Rational numbers are written as decimals or factions

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3 0
3 years ago
( Click on the photo to see fully)
Firlakuza [10]

Though these segments aren't marked congruent in the diagram, the two lines inside the circle making up the bases of the triangles are congruent as all radii are congruent. So the triangles are congruent by SAS.

7 0
3 years ago
I need to know what the answer is ty!!
Katyanochek1 [597]

Answer: 5:-)

Step-by-step explanation:

6 0
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