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3 years ago

1+4=5 2+5=12 3+6=24 5+8=? What's the answer

Mathematics

1 answer:

Vilka [71]3 years ago

8 0

I have seen this problem before, except it was worded differently. Is this the problem you wished to express?

1+4=5, 2+5=12, 3+6=21, 8+11=?

If so, then your answer is to simply add the last answer to the next problem. If not, then I am afraid I cannot help you.

1+4=5

5+2+5=12

12+3+6=21

21+8+11=40

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2 years ago

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4 years ago

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We have to perform a test of hypothesis on the proportion.

The claim is that the proportion of US teens that have some level of hearing loss differs from 20%.

Then, the null and alternative hypothesis are:

$H_0: \pi=0.20\\\\H_a:\pi\neq0.20$

The significance level is assumed to be 0.05.

The sample, of size n=1981, has 369 positive cases. Then, the proportion is:

$p=X/n=369/1981=0.186$

The standard error of the proportion is:

$\sigma_p=\sqrt{\dfrac{\pi(1-\pi)}{n}}=\sqrt{\dfrac{0.2*0.8}{1981}}=\sqrt{ 0.000081 }= 0.009$

Now, we can calculate the statistic z:

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The P-value for this two-tailed test is:

$P-value=2*P(z$

The P-value is below the significance level, so the effect is not significant. The null hypothesis failed to be rejected.

There is no enough evidence to support the claim that the proportion of US teens that have some level of hearing loss differs from 20%.

7 0

3 years ago