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3 years ago

Help please and thanks

Mathematics

2 answers:

marin [14]3 years ago

8 0

Answer:

option A

Step-by-step explanation:

plz mark my answer as brainlist plzzzz . hope this will be helpful to you.

kondor19780726 [428]3 years ago

5 0

A
Because 1x4 is 4 and and 5x4 is 20 equaling 4/20 so they are equal

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HEL ASAP PLEASEThe dimensions of a square with side measurements of 4 inches are doubled. What happens to the area of the square

Llana [10]

Answer:

The area is multiplied by 4

Step-by-step explanation:

4x4=16 (area 1)

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64/16=4

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4 years ago

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3 years ago

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Step-by-step explanation:

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3 years ago

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e-lub [12.9K]

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3 years ago

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Papessa [141]

Answer: 95% confidence interval for the difference between the proportions would be (1.31, 1.39).

Step-by-step explanation:

Since we have given that

Number of alluvial wells = 349

Number of quaternary wells = 143

Number of alluvial wells that had concentrations above 0.1 = 182

Number of quaternary wells that had concentrations above 0.1 = 112

Average of alluvial wells = 0.27

Standard deviation = 0.4

Average of quaternary wells = 1.62

Standard deviation =1.70

So, 95% confidence interval gives

alpha = 5% level of significance.

$\dfrac{\alpha}{2}=2.5\%\\\\z_{\frac{\alpha}{2}}=1.96$

So, 95% confidence interval becomes,

$(1.62-0.27)\pm 1.96\sqrt{\dfrac{0.4^2}{349}+\dfrac{1.7^2}{143}}\\\\=1.35\pm 1.96\times 0.020\\\\=(1.35-0.040,1.35+0.040)\\\\=(1.31,1.39)$

Hence, 95% confidence interval for the difference between the proportions would be (1.31, 1.39).

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3 years ago