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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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The average weight of the three lion cubs at the zoo was 288 pounds. Two of the cubs weighed 261 and 252 pounds. What was the we
stiv31 [10]

Answer:

351 pounds

<h2>Step-by-step explanation:</h2>

288 x 3 = 864 pounds

864 - 261 - 252 = 351 pounds

Therefore (261 + 252 + 351)/3 = 288.

So the answer is 351 pounds

8 0
3 years ago
The slope of the line below is 2. Which of the following is the point-slope form of the line? the x is 1 and the y is -1
sukhopar [10]
The point slope form would be y+1=m(x-1)


5 0
4 years ago
Read 2 more answers
Twice the difference of a number 2 and 5 is ?
alexandr1967 [171]

Answer:

<u>n= 4.5</u>

Step-by-step explanation:

The equation is:2(n-2)=5

Step 1- You need to do the parentheses.

The new equation is:

2n-4=5

Step 2-Next you add 4 to both sides of the equal sign.

The new equation is:

2n=9

Step 3- Now you divide by 2 into both sides and get the answer.

Answer:

<u>n=4.5</u>

8 0
3 years ago
A rock is released from rest and freely falls 70 m to the ground. What is its velocity just before impact? A. 1.2 m/s B. 7.0 m/s
Yuri [45]

Answer:

37.04 m/s

Step-by-step explanation:

we can use the equation x = x0 + v0t + 1/2at^2

a = -9.8 m/s^2, the acceleration due to gravity

x0 = 70 m, the starting point of x

v0 = 0 m/s

x = 0

this will allow us to solve for time

0 = 70 + 0 +-4.9t^2

t = 3.779

now we can use the equation v = v0 + at

v = 0 + 9.8(3.77)

v = 37.04 m/s

5 0
3 years ago
Assuming the probability of a single sample testing positive is 0.15​, find the probability of a positive result for two samples
Grace [21]

Answer:

P(Positive\ Mixture) = 0.2775

The probability is not low

Step-by-step explanation:

Given

P(Single\ Positive) = 0.15

n = 2

Required

P(Positive\ Mixture)

First, we calculate the probability of single negative using the complement rule

P(Single\ Negative) = 1 - P(Single\ Positive)

P(Single\ Negative) = 1 - 0.15

P(Single\ Negative) = 0.85

P(Positive\ Mixture) is calculated using:

P(Positive\ Mixture) = 1 - P(All\ Negative) ---- i.e. complement rule

So, we have:

P(Positive\ Mixture) = 1 - 0.85^2

P(Positive\ Mixture) = 1 - 0.7225

P(Positive\ Mixture) = 0.2775

<em>Probabilities less than 0.05 are considered low.</em>

<em>So, we can consider that the probability is not low because 0.2775 > 0.05</em>

6 0
3 years ago
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