Which of the following is not a possible r-value? A.0.3 B.-0.3 C.-1.6 D.0.6

Mathematics

2 answers:

sveta [45]3 years ago

8 0

|r| ≤ 1
selection C cannot be a value of r.

aliya0001 [1]3 years ago

5 0

Answer:

option C $-1.6$

Step-by-step explanation:

we know that

The correlation coefficient r is used in statistics to measure how strong a relationship is between two variables. The value of r is always between $+1$ and $-1$

The value of $-1.6$ is not a possible r-value

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7 0

3 years ago

(255)/(6)*(672)/(9)+(37)/(9) How do you work this out step by step??

koban [17]

Step 1. Type it into a Google search box or calculator. (You need to use a calculator anyway.) The result is 3177 4/9.

If you're doing this according to the Order of Operations, you do the multiplication and division left to right. This means the first calculation you do is
255/6 = 42.5
Next, you multiply by 672
42.5*672 = 28560
Then divide by 9
28560/9 = 3173 3/9

You continue by doing the division
37/9 = 4 1/9

And finish by adding the two results
3173 3/9 + 4 1/9 = 3174 4/9

_____
If you're doing this by hand, you can recognize the first term as the product of two fractions, so is the product of numerators divided by the product of denominators.
(255*672)/(6*9)
Using your knowledge of divisibility rules, you can do the division 672/6 to simplify this to
(255*112)/9
Now, the first term and the second term have the same denominator, so you can add the numerators before you do the division.
(255*112 + 37)/9 = (28560 + 37)/9 = 28597/9
You end up having to do only two simple divisions, rather than 3 of them.
28597/9 = 3177 4/9