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nlexa [21]
3 years ago
15

Oil prices are projected to increase by 75% by next May. A quart of oil currently costs $2.15. What is the projected cost of a g

allon of oil next May?
Mathematics
1 answer:
ivann1987 [24]3 years ago
3 0

Answer:

$3.7625

Step-by-step explanation: I may be wrong but...

If you find 75% of $2.15 it is equal to $1.6125.

Since in "increases" we are going to add $1.6125 to $2.15.

You get the answer of $3.7625.

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Suppose that at a state college, a random sample of 41 students is drawn, and each of the 41 students in the sample is asked to
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Answer:

The  confidence interval for 90% confidence would be narrower than the 95% confidence

Step-by-step explanation:

From the question we are told that

  The  sample size is n = 41

   

For a 95% confidence the level of significance is  \alpha  = [100 - 95]\% =  0.05 and

the critical value  of  \frac{\alpha }{2}  is   Z_{\frac{\alpha }{2} } =Z_{\frac{0.05 }{2} }=  1.96

For a 90% confidence the level of significance is  \alpha  = [100 - 90]\% =  0.10 and

the critical value  of  \frac{\alpha }{2}  is   Z_{\frac{\alpha }{2} } =Z_{\frac{0.10 }{2} }=  1.645

So we see with decreasing confidence level the critical value  decrease

Now the margin of error is mathematically represented as

         E =  Z_{\frac{\alpha }{2} } *  \frac{s}{\sqrt{n} }

given that other values are constant and only Z_{\frac{\alpha }{2} } is varying we have that

         E\ \  \alpha \ \   Z_{\frac{\alpha }{2} }

Hence for  reducing confidence level the margin of error will be reducing

  The  confidence interval is mathematically represented as

        \= x  - E  <  \mu <  \= x  + E

Now looking at the above formula and information that we have deduced so far we can infer that as the confidence level reduces , the critical value  reduces, the margin of error  reduces and the confidence interval becomes narrower

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2 years ago
An art curator records statistics about three new exhibits at her art museum. The mean age of the artifacts and the standard dev
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Definitely exhibit A
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Which equation can be used to represent six added to twice the sum of a numbee and four is equal to one half of the difference o
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Step-by-step explanation:

let the number be x , then :

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6 + 2 (x+4)

one half of the difference of three and the number means :

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combining the two , we have

6 + 2 (x+4) = \frac{3}{2}(3-x)

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File attached <br> Please help
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Answer:

the answer is C, 369

Step-by-step explanation:

1. divide 800 by 40 which will give you 20

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Cole is having his car repaired. The mechanic said it would cost at least $375 for parts
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Step-by-step explanation:

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