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Leto [7]
3 years ago
6

Please solve this -3=a/6

Mathematics
2 answers:
nydimaria [60]3 years ago
8 0
-3= a/b should equal to -0.5


andreev551 [17]3 years ago
7 0
The answer is -18=a because you multiply both sides by 6 to get a by itself
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In selecting a sulfur concrete for roadway construction in regions that experience heavy frost, it is important that the chosen
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Given - In selecting a sulfur concrete for roadway construction in regions that experience heavy frost, it is important that the chosen concrete has a low value of thermal conductivity in order to minimize subsequent damage due to changing temperatures. Suppose two types of concrete, a graded aggregate and a no-fines aggregate, are being considered for a certain road. The table below summarizes data on thermal conductivity from an experiment carried out to compare the two types of concrete.

Type            ni                xi                  si

Graded       42           0.486            0.187

No-fines      42           0.359           0.158

To find - a. Formulate the above in terms of a hypothesis testing problem.

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a.)

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b)

Test statistic :

Z = \frac{x_{1} - x_{2} }{\sqrt{\frac{s_{1} ^{2} }{n_{1}}  + \frac{s_{2}^{2} }{n_{2}} } }

Z = \frac{0.486 - 0.359 }{\sqrt{\frac{0.03496 }{42}  + \frac{0.02496 }{42} } }

Z = \frac{0.127 }{\sqrt{0.001468}}

Z = \frac{0.127 }{0.0377}

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As Z (cal) > Z(tab)

So, we reject H0 at 5% Level of significance

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Hence

There is significant difference in mean conductivity at the two materials.

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