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Svetllana [295]
3 years ago
5

!! HELP, I NEED HELP QUICKLY OR THE ANSWER!!!

Mathematics
1 answer:
Elena L [17]3 years ago
5 0

the answer should be a

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In September 2011, Gallup surveyed 1,004 American adults and asked them whether they blamed Barack Obama a great deal, a moderat
Alexus [3.1K]

Answer:

The 99% confidence interval for the proportion of all American adults who blame Barack Obama a great deal or a moderate amount for U.S. economic problems is (0.4894, 0.5706)..

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 zscore that has a pvalue of 1 - \frac{\alpha}{2}.

For this problem, we have that:

n = 1004, \pi = 0.53

99% confidence level

So \alpha = 0.01, z is the value of Z that has a pvalue of 1 - \frac{0.01}{2} = 0.995, so Z = 2.575.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.53 - 2.575\sqrt{\frac{0.53*0.47}{1004}} = 0.4894

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.53 - 2.575\sqrt{\frac{0.53*0.47}{1004}} = 0.5706

The 99% confidence interval for the proportion of all American adults who blame Barack Obama a great deal or a moderate amount for U.S. economic problems is (0.4894, 0.5706)..

3 0
3 years ago
Convert 7-11 to a percent. round to the nearest hundredth
n200080 [17]
7/11 is 0.006 percent.
5 0
3 years ago
Expression
Alex787 [66]
The value of the expression is -24

This is because you distribute the -4 to both of the values in the parenthesis like this:
-4(7) + -4(-1)
This can be simplified to:
-28 + 4
Which equals -24
Hope this helps!
4 0
3 years ago
How to write an area formula using the sides of the triangle a,b,c?
bearhunter [10]

Answer:

A=hb b/2

Step-by-step explanation:

area=height(sub)base times base divided by 2


4 0
3 years ago
BEST ANSWER GETS BRAINLIEST!! HELP PLEASE
skad [1K]
Area of the sign ( trapezoid ) :
A = ( a + b ) / 2 · h 
where: a = 8, b = 5, h = 5
A = ( 8 + 6 ) / 2 · 5 = 
= 14/2  · 5 = 7 · 5 = 35 ft²
Answer:
B ) 35 square feet
7 0
3 years ago
Read 2 more answers
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