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Vesna [10]
3 years ago
6

Jessica was planting flower seeds in a garden. She planted 26.53 square feet of seeds in 7 minutes. At what unit rate did Jessic

a plant seeds?
Mathematics
1 answer:
Snezhnost [94]3 years ago
5 0

Jessica planted 3.79 square feet of seeds each minute.

if we divide 26.53 by 7 we can get that answer

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In selecting a sulfur concrete for roadway construction in regions that experience heavy frost, it is important that the chosen
Lesechka [4]

Step-by-step explanation:

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.

b. Give the test statistic and its reference distribution (under the null hypothesis).

c. Report the p-value of the test statistic and use it to assess the evidence that this sample provides on the scientific question of difference in mean conductivity of the two materials at the 5% level of significance.

Proof -

a.)

Hypothesis testing problem :

H0 : There is significant difference between mean conductivity for the graded concrete and mean conductivity for the no fines concrete.

H1 : There is no significant difference between mean conductivity for the graded concrete and mean conductivity for the no fines concrete.

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}

⇒Z(cal) = 3.3687

Z(tab) = 1.96

As Z (cal) > Z(tab)

So, we reject H0 at 5% Level of significance

p-value = 0.99962

Hence

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

5 0
3 years ago
Solve <br> 7p + 8p - 12 = 59
ikadub [295]
combine like terms first
15p-12=59
add 12 ro both sides
15p=71
p=4.733
3 0
3 years ago
Read 2 more answers
-5x + 4 - x -1<br> Identify the terms, like terms, coefficients, and constants in each expression.
koban [17]

terms: -5x, 4, -x, -1

like terms: 4 and -1, -5x and -x

coefficients: -5 and -1

constants: 4 and 1

(depending on your teacher, the - could not be considered part of the coeficient, meaning the coefficents would be -5 and 1, as well as just x, not -x)

3 0
3 years ago
Read 2 more answers
Estimate the quotient to the nearest whole number by using compatible numbers. 14.991 divided 5.3
oksano4ka [1.4K]
It would be,8.0.

Hope that helps.
7 0
3 years ago
Read 2 more answers
Carla bout a digital camera that cost $91.98. She also bought 2 identical memory cards and a camera case. The camera cost 6 time
n200080 [17]

Answer:

$6.99 for each memory card.

Step-by-step explanation:

she paid a total of 127.35 for everything including sales tax.  

if the camera cost 6 times more than the case you will first divide 91.98 by 6

91.98/6 = 15.33 total cost of the case

so now you subtract your camera, case and sales tax from the total amount she paid which is 127.35

127.35 - 91.98 - 15.33 - 6.06 = 13.98 is left to find the price of each memory card you divide 13.98 by 2

13.98/2 = 6.99

3 0
3 years ago
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