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ruslelena [56]
3 years ago
7

Can Anyone Help Me

Mathematics
1 answer:
Dmitry_Shevchenko [17]3 years ago
5 0
A. hundreds
250 bars * $2 each = $500
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A recent study asked U. S. Adults to name 10 historic events that occurred during their lifetime that have had the greatest impa
Nadusha1986 [10]

Using the z-distribution, as we are working with a proportion, it is found that the 99% confidence interval for the proportion of all U. S. Adults who would include the 9/11 attacks on their list of 10 historic events is (0.7458, 0.7942). It means that we are 99% sure that the true proportion for all U.S. adults is between these two bounds.

<h3>What is a confidence interval of proportions?</h3>

A confidence interval of proportions is given by:

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

In which:

  • \pi is the sample proportion.
  • z is the critical value.
  • n is the sample size.

In this problem, the parameters are:

z = 2.575, n = 2000, \pi = 0.77

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.77 - 2.575\sqrt{\frac{0.77(0.23)}{2000}} = 0.7458

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.77 + 2.575\sqrt{\frac{0.77(0.23)}{2000}} = 0.7942

The 99% confidence interval for the proportion of all U. S. Adults who would include the 9/11 attacks on their list of 10 historic events is (0.7458, 0.7942). It means that we are 99% sure that the true proportion for all U.S. adults is between these two bounds.

More can be learned about the z-distribution at brainly.com/question/25890103

7 0
2 years ago
I will give brainliest
allochka39001 [22]

Answer:

1) Yes 2)No

Step-by-step explanation:

1) Yes because the two shorter lines combined are longer than the base and so those two lines are able to make a triangle.

2) No because the two lines on top will be equal to base line and so the two shorter lines will not be able to make a third angle because it will be level with the base.

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3 years ago
What are the solutions of the quadratic equation p^2+3p-28=40
vivado [14]

Answer:

the answer is  =-3±\sqrt{281}/2

Step-by-step explanation:

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3 years ago
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Using the graph at the left, it shows the height h in feet
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Answer:

1 second

Step-by-step explanation:

h(+-)16+power 2+128+

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3 years ago
!!!HELP ME WITH THIS QUESTION PLEASE!!!
Triss [41]

Answer:

C

Step-by-step explanation:

Hope this helps

7 0
2 years ago
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