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Dominik [7]
3 years ago
14

Ashley is making cookies for

Mathematics
1 answer:
allochka39001 [22]3 years ago
8 0

Answer:

1.6 cups of sugar

Step-by-step explanation:

0.4 cups per batch.

4 batches.

Total sugar required = 0.4 x 4

= 1.6 cups of sugar

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What sample size is needed to give a margin of error within in estimating a population mean with 95% confidence, assuming a prev
atroni [7]

Answer:

n = (\frac{1.96\sqrt{\pi(1-\pi)}}{M})^2

The sample size needed is n(if a decimal number, round up to the next integer), considering the estimate of the proportion \pi(if no previous estimate use 0.5) and M is the desired margin of error.

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 z-score that has a p-value of 1 - \frac{\alpha}{2}.

The margin of error is of:

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

95% confidence level

So \alpha = 0.05, z is the value of Z that has a p-value of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

Needed sample size:

The needed sample size is n. We have that:

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

M = 1.96\sqrt{\frac{\pi(1-\pi)}{n}}

\sqrt{n}M = 1.96\sqrt{\pi(1-\pi)}

\sqrt{n} = \frac{1.96\sqrt{\pi(1-\pi)}}{M}

(\sqrt{n})^2 = (\frac{1.96\sqrt{\pi(1-\pi)}}{M})^2

n = (\frac{1.96\sqrt{\pi(1-\pi)}}{M})^2

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You found the prime factorization of the number 72. Explain how you can check your answer.
ch4aika [34]

To find out whether a prime factorization is correct, verify that all the factors are indeed prime. Then multiply the factors. The product should equal 72.

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