A researcher recruits a sample of 25 preschool children for a research study by posting an announcement in a local daycare center describing the study and offering a $10 payment for participation. What kind of sampling is the researcher using?

The kind of sampling the researcher is using is Convenience sampling method.

Step-by-step explanation:

Convenience sampling is a kind of non probability sampling. A non probability sampling is a type of sampling where the probability of selecting a sample is  not defined.

In case of convenience sampling the researcher targets the population nearest to him/her or the quite accessible population. For example, sampling done at a shopping mall or a college campus.

There are no other conditions applied while conducting a convenience sampling. The only criteria is that the participants are willing to participate. For this too the researcher can offer to pay certain amount to the participants so that they participate in the research.

In the provided problem the researcher samples preschool students at a local daycare center. He also pays $10 for each participation.

This is an example of Convenience sampling method.

then, the surface area of the sphere shown in the image is: 256π sq. units!

step-by-step explanation:

the lateral surface area of a sphere is 2πrh where h=2r.

then:

surface area = 4πr^2.

in this case, r=8 units ⇒ surface area = 4π(8 units)^2. = 256π sq. units!

then, the surface area of the sphere shown in the image is: 256π sq. units!

f(x) is the value of the function. b is the value of the function when x equals zero or the y-coordinate of the point where the line crosses the y-axis in the coordinate plane.

step-by-step explanation:

hope this !