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Ratling [72]
3 years ago
9

Barry draws the model below and says it proves that 1,243 : 3 = 481.

Mathematics
1 answer:
murzikaleks [220]3 years ago
6 0

Answer:484

Step-by-step explanation:

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3 > 3/4

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7.1.35-T Question Help You are the operations manager for an airline and you are considering a higher fare level for passengers
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Answer:

You must survey 784 air passengers.

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

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The margin of error is:

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

95% confidence level

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

Assume that nothing is known about the percentage of passengers who prefer aisle seats.

This means that \pi = 0.5, which is when the largest sample size will be needed.

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We have to find n for which M = 0.035. So

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0.035 = 1.96\sqrt{\frac{0.5*0.5}{n}}

0.035\sqrt{n} = 1.96*0.5

\sqrt{n} = \frac{1.96*0.5}{0.035}

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