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EleoNora [17]
4 years ago
5

An environmentalist would like to compare air pollution levels in cities A and B. From each city 10 measurements are taken. For

city A, the average of all measurements (where measurements are percentage of pollutants in the air) is 5 percent with sample standard deviation 1.5 percent. For city B the average of all 10 measurements is 5.4 percent with sample standard deviation 2 percent. Assume that for each city air pollution level at a random time and location follows a normal distribution, and nd a 90% confidence interval for difference between the true average air pollution levels of city A and city B.
Mathematics
1 answer:
tankabanditka [31]4 years ago
4 0

Answerhshxbx

Ste-by-step explanation:

Hwsjbb

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What are the zeros of the parabola whose equation is y = x2 + 8x + 15
Sedbober [7]

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Answer:

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Step-by-step explanation:

Descarte's rule of signs tells you the lack of sign changes among the coefficients means there are <em>no positive real roots</em>. That eliminates all answer choices except the first one.

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If you want to go to the trouble, you can factor the equation:

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Savatey [412]
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4 years ago
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gregori [183]
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5 0
2 years ago
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Find in the triangle. Round to the nearest degree.<br> a.<br> 45°<br> C. 60°<br> b. 59°<br> d. 42°
aleksklad [387]

Answer:

Theta = 59 degrees

Step-by-step explanation:

Here, we want to get the value of the marked angle

To do this, we use the appropriate trigonometric ratio

From what we have,

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Cos theta = 42/82

theta = cos^-1 0.5122

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To the nearest degrees, this is 59 degrees

6 0
3 years ago
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Ivanshal [37]

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Step-by-step explanation:

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