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3 years ago

Most evenings after dinner Duarte spends 30 minutes playing chess with his dad.

Mathematics

1 answer:

katovenus [111]3 years ago

4 0

Answer:

m = 30 * e

e=4 m= 120

e=6 m = 180

Step-by-step explanation:

total minutes = minutes * evenings

m = 30 * e

if e =4

m = 30 * 4 = 120

if e = 6

m = 30 * 6 = 180

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3 years ago

In a random sample of students who took the SAT test, 427 had paid for coaching courses and the remaining 2733 had not. Calculat

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The 95% confidence interval for the proportion of students who get coaching on the SAT is (0.1232, 0.147).

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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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This means that $n = 427 + 2733 = 3160, \pi = \frac{427}{3160} = 0.1351$

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The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.1351 + 1.96\sqrt{\frac{0.1351*0.8649}{3160}} = 0.147$

The 95% confidence interval for the proportion of students who get coaching on the SAT is (0.1232, 0.147).

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3 years ago