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Troyanec [42]
3 years ago
14

In an effort to learn more about the wild lemur population in Madagascar, a researcher wants to collect a sample. Which statemen

t is true?
A. The researcher can assign each lemur a number and then use systematic sampling.
B. It is possible to collect a simple random sample of all wild lemurs in Madagascar.
C. Sample bias is inevitable because the researcher can only collect a convenience sample.
D. To reduce time and cost, the researcher must collect a volunteer sample.
Mathematics
1 answer:
steposvetlana [31]3 years ago
3 0

A reseacher wants to collect a sample to learn more about the wild lemur population in Madagascar. According to this, the true statement is the reseacher can assign each lemur a number and then use a systematic sampling (option A).

Systematic sampling is a form of sampling characterized by choosing the sample at random. According to the above, random sampling is the best option for the researcher.

It is not easy to study the entire population of lemurs in Madagascar, therefore systematic sampling is ideal. In this way, the researcher can sample a few lemurs and using this probability method can draw conclusions.

According to the above, the correct answer is A. because it presents information corresponding to the situation presented.

Learn more in: brainly.com/question/24317913

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The length of a rectangle is four times its width.
Irina-Kira [14]

Answer:

Length = 24 yd

Width = 6 yd

Step-by-step explanation:

To start out, we can begin by saying that "l" is the length of the rectangle, and "w" is the width.

Since we know that the length (l) is 4 times its width we can say that 4 times the width is equal to its length. We would write this out this way :

4w = l

Next, we know that the perimeter is 60yd (as it is given in the question). We also know that the perimeter of a rectangle is all of its sides, added. Meaning the length plus the length, plus the width and the width. So, we can use the equation :

2l + 2w = p

"p" being the perimeter. And, since the perimeter is 60, we can place in 60 for "p"

2l + 2w = 60

Now we can use this information to combine the terms, and find the width and length. We first do this by noticing that in the first equation, it shows that "l" (the length) is equal to 4w. This means that we can put 4w in place of the "l" in the second equation. We can do this, becuase we know that "l" is equal to 4w. (from the first eqaution)

2 (4w) + 2w = 60

Now, we solve

2 * 4w = 8w

8w + 2w = 10w

So now we have :

10w = 60

To get the width, all we have to do is simply get "w" alone. We can do this by dividing both sides by 10.

10w = 60

/10     /10

w = 6

Therefore, the width is 6.

Now, going back to the first equaiton, we already know that the length is 4 times the width, meaning all we have to do is multiply 6 by 4 to get the length.

6 * 4 = 24.

Therefore, the length is 24.

Lastly, to check and make sure we are correct, we can go back to the second equation. 2l + 2w = 60

2 (24) + 2 (6) = 60

2 * 24 = 48

2 * 6 = 12

48 + 12 = 60

60 = 60

Now, we officially know that the length of the rectangle is 24 and the width is 6.

6 0
2 years ago
Substitution method...need help.. started but cant finish
trapecia [35]

Solve either equation for either variable. Since the second one has y on its own, the easiest choice is to solve that for y.

-5x + y = 13   ⇒   y = 5x + 13

Now substitute this into the other equation to eliminate y and rewrite it entirely in terms of x :

-3x + 3y = 3   ⇒   -3x + 3 (5x + 13) = 3

Simplify and solve for x :

-3x + 15x + 39 = 3

12x = -36

x = -3

Substitute this into either original equation to solve for y. Plugging x = -3 into the first equation would give

-3 (-3) + 3y = 3

9 + 3y = 3

3y = -6

y = -2

So the solution to the system of equations is (x, y) = (-3, -2).

8 0
2 years ago
Use the drag and drop tiles to determine whether the number is rational or not rational
8090 [49]
The answer to this question is not rational
6 0
3 years ago
What is the following product? sqr root 10 x sqr root 10
DENIUS [597]

Answer:

10

Step-by-step explanation:

Note that \sqrt{a} × \sqrt{a} = a

Consider the following example

\sqrt{100} × \sqrt{100}

= 10 × 10

= 100 ← the value inside the radical, thus

\sqrt{10} × \sqrt{10} = 10

6 0
3 years ago
Hi everyone... I am giving points... I repeat points
Snezhnost [94]

Answer:

why are you people giving them away???????

and btw how was your day?

and thanks fro the points

Step-by-step explanation:

4 0
3 years ago
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