Can you help me! ln this question .and explain it in step by step (optional math)

Mathematics

1 answer:

photoshop1234 [79]3 years ago

8 0

Answer:

$\frac{6}{ \sqrt{3 } } - 2 \sqrt{2} - \frac{5 \sqrt{3} }{4} = 6 - 2 \sqrt{6} - \frac{15}{4} = \frac{9}{4} - 2 \sqrt{6}$

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In a sample of 70 stores of a certain company, 62 violated a scanner accuracy standard. It has been demonstrated that the condi

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Answer:

We need at least 243 stores.

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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For this problem, we have that:

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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 $Z = 1.96$ .

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We need at least n stores.

n is found when M = 0.04. So

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

$0.04 = 1.96\sqrt{\frac{0.886*0.114}}{n}}$