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jeka94
3 years ago
6

A researcher wants to obtain a sample of 30 preschool children consisting of 10 two-year-old children, 10 three-year-old, and 10

four-year-old children. Assuming that the children are obtained from local daycare centers, this researcher should use ____ sampling.
Mathematics
1 answer:
VMariaS [17]3 years ago
3 0

Answer:

Quota sampling

Step-by-step explanation:

Quota sampling is a type of sampling method in which a representative data is collected from a group. It is a non probability based sampling method, a type of stratified sampling. Quota sampling is required when researchers are working with limited time and are without a sampling frame. Quota sampling method helps to determine the characteristics of a subgroup under research. It is an highly accurate method of sampling.

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Solutions of x2 + 13x + 30 = 0 by factoring.
VMariaS [17]

Answer:

x = -10 or x = -3

Step-by-step explanation:

Here, the given equation is

x^{2}  + 13x + 30 = 0

The given equation can be solved by the method of SPLITTING THE MIDDLE TERM

Split 13 in such a way that sum of the terms = 13

and product of the terms = 30

So, the given equation becomes x^{2}  + 10x + 3x + 30 = 0

Here, 10x+ 3x = 13x and 10 x 3 = 30

Now, simplifying the equation,

x(x+10) + 3(x + 10) = 0 \\(x+3) (x+10) =0

⇒ either (x+ 10) = 0 ,or (x+ 3) = 0

⇒ x = -10 or x = -3

4 0
3 years ago
Complete the sentence to make it a true statement. 60 is 1/100 of
Over [174]

Answer:

6000

Step-by-step explanation:

If it is one hundredth than multiply by 100 to get 6000

3 0
3 years ago
FACTOR and list your 4 steps: 5x^2y - 30xy^2
Dahasolnce [82]

Answer:

5x • (x + 3y) • (x - 2y)

Step-by-step explanation:

6 0
3 years ago
The product of three numbers is -216, but their sum is -18. <br><br> I’ll give 18 points!!!!
sergey [27]
-6 x -6 x -6 = -216
-6 + -6 + -6 = -18
So the answer is negative 6
8 0
4 years ago
On average a herd of elephants travels 10 miles in 12 hours<br>(picture included)
Tema [17]
For the first Q the answer is the first square on the left 10 miles divided by 12 hours = 0,83 miles

And the second Q goes with the last square 12 hours divided by 10 miles = 1.2 h which in minutes is 72 minutes or 1h and 12 minutes.
4 0
3 years ago
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