How do you know weather two quantities x and y are proportional?

Mathematics

1 answer:

Colt1911 [192]3 years ago

8 0

Answer:

every difference x-y is the same for related pairs of x and y

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What is the gcf of 12 and 36

timofeeve [1]

The gcf would be 12 because both 12 and 36 can be divided by 12 and it is the highest number

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4 years ago

I really don't get this please help

Fiesta28 [93]

21 3/16...as a decimal
the 21 is a whole number and goes to the left of the decimal....and the fraction 3/16 goes to the right of the decimal.
3/16 = 0.1875....now add ur 21 and u get 21.1875 inches wide

2 3/8....as a decimal
3/8 = 0.375....now put ur 2 in there and it becomes 2.375 inches thick

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3 years ago

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Eva8 [605]

Answer:

I cannot see image

Step-by-step explanation:

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4 years ago

−10=2y Hello Help Me

marin [14]

The answer is -5

Explanation: Divide 2 to get rid of the top number. It looks like this

-10. 2y
___. ___

2. 2

What this does is remove the two from the Y and sets it by itself. Then you divide the -10, and the answer is -5

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3 years ago

A recent survey based on a random sample of n=470 voters, predicted that independent candidate for the mayoral election will get

julsineya [31]

I have an expression

$\sigma = \sqrt{p(1-p)/n}$

floating around in my head; let's see if it makes sense.

The variance of binary valued random variable b that comes up 1 with probability p (so has mean p) is

$E( (b-p)^2 ) = (-p)^2(1-p) + (1-p)^2p = p(1-p)$

That's for an individual sample. For the observed average we divide by n, and for the standard deviation we take the square root:

$\sigma = \sqrt{p(1-p)/n}$

Plugging in the numbers,

$\sigma = \sqrt{.24(1-.24)/490} = 0.019 = 1.9\%$

One standard deviation of the average is almost 2% so a 27% outcome was 3/1.9 = 1.6 standard deviations from the mean, corresponding to a two sided probability of a bit bigger than 10% of happening by chance.

So this is borderline suspect; most surveys will include a two sigma margin of error, say plus or minus 4 percent here, and the results were within those bounds.

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4 years ago