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Juliette [100K]
3 years ago
12

Please help! Will give Brainliest!

Mathematics
1 answer:
Serhud [2]3 years ago
8 0

Answer:

A

Step-by-step explanation:

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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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Answer:

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

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}.

427 had paid for coaching courses and the remaining 2733 had not.

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

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.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.1351 - 1.96\sqrt{\frac{0.1351*0.8649}{3160}} = 0.1232

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
What is the selling price of a $2,499 motorcycle if a $249 discount is given?
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The answer is $2,250. (D). To get the answer you do 2,499-249= 2,250. Hope this helps!!
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A family drove 1 /5 of the total distance to the coast on the first day. They drove another2/5 of the distance on the second day
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The sum of two and the quotient of a number x and five
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The sum of two and the quotient of a number x and fine.

sum= +

two= 2

quotient= divide

five= 5

2+ x/5 <- should look something like this

I hope this helps!
~kaikers


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3 years ago
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Write the exponential equation for the given situation. A tennis tournament starts with 128 participants. Each round, half of th
inysia [295]

Answer:

y= 128(1-.5)^t

Step-by-step explanation:

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