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Leona [35]
2 years ago
8

Please help, i’ll give brainliest!!!

Mathematics
1 answer:
mr Goodwill [35]2 years ago
3 0
I’m pretty sure its b
Don’t give me brain- whatever it is it’s most likely wrong
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The article "Occurrence and Distribution of Ammonium in Iowa Groundwater" (K. Schilling, Water Environment Research, 2002:177–18
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).

6 0
3 years ago
What is the justification for each step in solving the inequality? -5(4x+6<-18x+6+4x
Daniel [21]
Hi there!

Everything looks correct except for the step to get to -6x < 36. Here you put multiplication property of order, and to get here you have to add 30 to both sides, so it would actually be the addition property of order.

I hope I helped!
5 0
3 years ago
What is the surface area of a cube with a side length of 8 mm
Tcecarenko [31]
S=6a²
a=8mm
S = 6 * 8² = 6 * 64 = 384 mm²
7 0
3 years ago
Read 2 more answers
Whats two hundred fifty six thousand in standard form
Gala2k [10]
Standard form means write the normal way so the answer is 256,000
7 0
3 years ago
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Which situation can not be represented by the equation x 10 45?
PolarNik [594]

Step-by-step explanation:

So, the variable x can not represent adults and students because they tell us that 45 are clearly students.

7 0
3 years ago
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