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sertanlavr [38]
3 years ago
7

The volume of water in a resevoir decreases 21,000 cubic yards over a 3-month period. What is the average change in volume per m

onth?
Please Help and solve this with an honest answer
Mathematics
2 answers:
valentinak56 [21]3 years ago
7 0

Answer:

7000 cubic yards

Step-by-step explanation:

Given :The volume of water in a reservoir decreases 21,000 cubic yards over a 3-month period.

To Find:What is the average change in volume per month?

Solution:

Since we are given that The volumes of water decreases by amount in 3 months = 21000 cubic yards

So, the volume decreased per month = \frac{21000}{3}

                                                               = 7000 yards^3

Thus  the volume decreased per month is 7000 cubic yards .

Hence the average change in volume per month is 7000 cubic yards

                                                               

Brut [27]3 years ago
4 0
The average change is 7,000. hope I helped
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Answer:

a. two-tailed test

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Step-by-step explanation:

We will use a Z test to resolve this, an it will be a two-tailed test because the hypothesis statements are not indicating a specific direction for the significant difference (H0 : μ1 = μ2 ; H1 : μ1 ≠ μ2), this also means that the significanclevel will be divided between the both tails (2.5% en each tail for the rejection regions). See attached drawing for reference.

We need to find our critical value:

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If we look for 0.025 in a Z table we will find that the critical value is 1.96 to the right, and by symmetry -1.96 to the left. So our decision rule will be to reject H0 if Z>1.96 or Z<-1.96

The Z test will be done using the next equation:

Z = (x⁻1 - x⁻2) - (μ1 - μ2) / √( σ²1/n1 + σ²2/n2

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Z = (100.5 - 98.8) - (0) / √( (3.4)²/38 + (5.8)²/51 = 1.7/0.9817 = 1.73

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The P-value for this test would be represented by the probability of Z being greater than 1.73, so we can look for it in any Z table, finding that its value is 0.0418, and because P-value>0.025 we again confirm that we don't have evidence statistically significant to reject the null hypothesis

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Step-by-step explanation:

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The reflection is written as:

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<h3>How to get the graph of the reflection?</h3>

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If you want to learn more about reflections:

brainly.com/question/4289712

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