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NeTakaya
3 years ago
14

The DNR is planning a study to determine whether breakwaters help decrease erosion at a large lake. They divide the shoreline in

to 100-foot plots, installing some with breakwaters and some without. However, the east and west shorelines of this lake receive very different wave patterns due to the wind. The DNR suspects this will affect the responses to the breakwaters. Because of this, the DNR plans to treat each shoreline as a different group. This study is an example of:
(A) An uncontrolled experiment(B) A blocked design experiment.(C) A matched pairs experiment.(D) A stratified random sample(E) A randomized observational study
Mathematics
2 answers:
Vera_Pavlovna [14]3 years ago
6 0

Answer:

(D) A stratified random sample

Step-by-step explanation:

A stratified random samples are samples that involves the use of stratified random sampling (or stratification) which involves the partition or division of a population into smaller subgroups (called strata). The division is done based on some shared characteristics and attributes. The case above is a stratified random sample because it involves the division of shoreline(population) into 100-foot plots(stratas or subgroups).

Triss [41]3 years ago
6 0

Answer:

B

Step-by-step explanation:

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Original: $458<br> Discount:<br> New: $137.40
Vanyuwa [196]

Answer:

Your answer would be 30% discount

Step-by-step explanation:

137.40 / 458 = .3

8 0
3 years ago
If 4/5 of a population of a certain town is considered to be middle class and the population of the town is 2000 how many people
const2013 [10]
First, you would need to create an equation for this problem.
\frac{4}{5} = \frac{x}{2,000}

Next, you would cross multiply. 
5x = 8,000

Now, all you would have to do is isolate the x. To do this, you would divide both sides by 5. 
x = <span>1,600

1,600 people are considered middle class. 

I hope this helps!</span>
8 0
3 years ago
Solve the following system of equations using the substitution method.
BartSMP [9]

Answer:

B

Step-by-step explanation:

First label the equations.

6x +3y= 18 -----(1)

y= -2x +5 -----(2)

subst. (2) into (1):

6x +3(-2x +5)= 18

6x +3(-2x) +3(5)= 18 (expand)

6x -6x +15= 18

15= 18 (simplify)

(reject)

There is no solution.

<u>Further explanation</u><u>:</u>

If I rewrite the first equation into the form of y=mx+c, I would get

6x +3y=18

3y= 18 -6x (bring y term to one side)

y= 6- 2x (÷3 throughout)

y= -2x +6

Notice that the gradients of both lines are equal ( -2). This implies that they are parallel to each other and will never meet. Hence there are no solutions.

3 0
3 years ago
Says the directions in the picture.<br> Please help me before my next geometry class tomorrow.
SashulF [63]
Distance formula= [(x2-x1)^2 + (y2-y1)^2]^1/2
Origin= white house = (0,0)
Capitol= (2300,800) 
Put the value,
(2300² + 800² )^1/2
= 2435 meters
Thus distance is 2435 m
3 0
3 years ago
Determine the pattern in the table and write the function rule. <br> Please help asap.
klio [65]

you need to find how much the output changes for each unit change in the input. (ie from an input change from 5 to 6 the output changes by three units and an input change of 3 (2 - 5 )  units the output changes by 9 units). This will give you the gradient of the equation. then you have to find out the y intercept by finding what the output is when the input is 0. Do this by multiplying the input by the gradient and then subtracting it from that inputs output. This will give you the answer A) 3x

(Sorry, its a bit wordy :) )

8 0
3 years ago
Read 2 more answers
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