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Len [333]
3 years ago
14

Plz help me ill give you brainlist

Mathematics
1 answer:
Ivan3 years ago
7 0
So, plug in what you're given and solve
 x is -2
(3x) * 9 
(3 (-2)) * 9
-6 * 9
-54

then 
27(-2)
-54
For the first it's the same

for the second
x is 0
(3x) * 9
(3 (0)) * 9
0 * 9
0

27x
27(0)
0
For the second it's the same

x is 4
(3x) * 9 
(3(4)) * 9
12 * 9
108

27x 
27(4)
108

The given expressions are equivalent. This was proved in the diagram. 

Hope this helps :)
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Answer:

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\alpha = \frac{1 - 0.7}{2} = 0.15

Now, we have to find z in the Z-table as such z has a p-value of 1 - \alpha.

That is z with a pvalue of 1 - 0.15 = 0.85, so Z = 1.037.

The margin of error is of:

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

Standard deviation was 0.21.

This means that \sigma = 0.21

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M = z\frac{\sigma}{\sqrt{n}}

M = 1.037\frac{0.21}{\sqrt{450}}

M = 0.01

The margin of error is of 0.01.

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