2 years ago

Could you help my math homework? ;-;Please

Mathematics

1 answer:

Gwar [14]2 years ago

5 0

Answer:

1 when -2<x<2

-1 when |x|>2

Step-by-step explanation:

Hope it helps

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After calculating the sample size needed to estimate a population proportion to within 0.05, you have been told that the maximum

Svetlanka [38]

Answer: 40000

Step-by-step explanation:

The formula to find the sample size is given by :-

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2$ , where p is the prior estimate of the population proportion.

Here we can see that the sample size is inversely proportion withe square of margin of error.

i.e. $n\ \alpha\ \dfrac{1}{E^2}$

By the equation inverse variation, we have

$n_1E_1^2=n_2E_2^2$

Given : $E_1=0.05$ $n_1=1000$

$E_2=0.025$

Then, we have

$(1000)(0.05)^2=n_2(0.025)^2\\\\\Rightarrow\ 2.5=0.000625n_2\\\\\Rightarrow\ n_2=\dfrac{2.5}{0.000625}=4000$

Hence, the sample size will now have to be 4000.

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2 years ago

Can some one help please

Dmitry [639]

180-130=50
180-96=84
angles in a triangle add up to 180
50+84=134
180-134=46
x=46 degrees

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3 years ago

B) Here are the first four terms of a quadratic sequence.

Nookie1986 [14]

Find answer is the given attachment

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2 years ago

Help and I’ll give brainlest answer

ollegr [7]

The answer is -88

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3 years ago

Evaluate The Following Expression<br><br> −7 × 7 + 9 × −1 /−1

UkoKoshka [18]

Answer:

-50+9x

Step-by-step explanation:

multiply the numbers -49+9x -1

calculate the difference(-49-1 -50 + 9x

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2 years ago

Could you help my math homework? ;-;Please ​

Could you help my math homework? ;-;Please