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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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2 years ago
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3 years ago
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Find the area of the rhombus.<br> A=<br> square units
mylen [45]

Answer: A=70 square units

Step-by-step explanation:

The area of a triangle can be found using the formula A=\frac{1}{2} bh

Let 5=h and 7=b

Plug in the values and solve

A=\frac{1}{2} (7)(5)

A=17.5

However, since four of these triangles make up this rhombus, we can multiply the area of one of these triangles by four to find the area of the whole rhombus.

A=17.5*4

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8 0
3 years ago
if the ball dropped from 12 feet and bounces up 2/3 as high on each successive bounce,what is the height of the fourth bounce?
White raven [17]

Answer:

2 10/27 ft . . . . or . . . . 2 feet 4 4/9 inches

Step-by-step explanation:

The height on the first bounce is ...

... (12 ft) × 2/3 = 8 ft

The height on the second bounce is ...

... (8 ft) × 2/3 = 16/3 ft

The height on the third bounce is ...

... (16/3 ft) × 2/3 = 32/9 ft

The height on the fourth bounce is ...

... (32/9 ft) × 2/3 = 64/27 ft = 2 10/27 ft

_____

<em>Conversion of fractional feet to inches</em>

10/27 ft = (12 in/ft) × (10/27 ft) = 40/9 in = 4 4/9 in

_____

<em>Explicit formula</em>

We can see that for each bounce (including the first), we multiply the initial height by 2/3. After n bounces, we have multiplied the initial height by (2/3)^n. Thus the height after n bounces will be ...

... h(n) = (12 ft)×(2/3)^n

For the 4th bounce, this is ...

... h(4) = (12 ft)×(2/3)^4 = (12 ft)×(16/81) = 64/27 ft

3 0
3 years ago
Stem and leaf plots, what is the mode median and range of the scores ​
frez [133]

Answer:

Mode = 81,  Median = 81 and Range = 39.

Step-by-step explanation:

The mode  is the most occurring value which is 81.

The median is also 81. There are a total of 19 numbers arranged in ascending order so the median is the 10th number.

The range is the highest - lowest number = 100 - 61 = 39.

8 0
3 years ago
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