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2 years ago

Fill in the 3 blank boxes

Mathematics

1 answer:

Ket [755]2 years ago

6 0

First one is 1 x 10^6
second is 2 x 10^8
third one is 157 times

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What is 100/200 + 300 - 700?

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Answer:

-399.5

Step-by-step explanation:

You divide, add, then subtract.

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2 years ago

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Find the product 78.3 * 0.45

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Answer:

35.235

Step-by-step explanation:

because 78.3*0.45 = 35.235

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Help me out help me show some work someone please ??

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Answer:

24$

Step-by-step explanation:

If she ended with 12 $ and she spends half of her money on the mini golf it means that you need to multiply 12 by 2 and you will get 24.

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2 years ago

Divide to find equivalent fraction 5/10=?

Anna007 [38]

I think the answer would be 2/5

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A researcher wants to estimate the percentage of all adults that have used the Internet to seek pre-purchase information in the

lara31 [8.8K]

Answer:

The sample size is 1875.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

Sampling error of 0.03.

This means that $M = 0.03$

99.74% confidence level

So $\alpha = 0.0026$ , z is the value of Z that has a pvalue of $1 - \frac{0.0026}{2} = 0.9987$ , so $Z = 3$ .

25% of all adults had used the Internet for such a purpose

This means that $\pi = 0.25$

What is the sample size

The sample size is n. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 3\sqrt{\frac{0.25*0.75}{n}}$

$0.03\sqrt{n} = 3\sqrt{0.25*0.75}$

Simplifying by 0.03 both sides

$\sqrt{n} = 100\sqrt{0.25*0.75}$

$(\sqrt{n})^2 = (100\sqrt{0.25*0.75})^2$

$n = 1875$

The sample size is 1875.

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2 years ago