The purpose of sampling is to
a. calculate all variables and observations within a population
b. obtain sufficient information to draw a valid inference about a population
c. measure all items of interest for a particular interest or investigation
d. enumerate all the values in the population

b. obtain sufficient information to draw a valid inference about a population

Explanation:

Sampling: In psychological research, the term sampling refers to the group of objects, items, or people that are being taken from a huge population for measurement in a study.

The sample taken from the population should be representative of the given population so that the researcher can generalize or make inference about the findings of the population as a whole.

In the question above, the purpose of sampling is to obtain sufficient information to draw a valid inference about a population.

answer; /// i do believe that the correct answer is (d) cooperative play; /// good luck

the earth’s crust is broken into separate pieces called tectonic plates (fig. 7.14). recall that the crust is the solid, rocky, outer shell of the planet. it is composed of two distinctly different types of material: the less-dense continental crust and the more-dense oceanic crust. both types of crust rest atop solid, upper mantle material. the upper mantle, in turn, floats on a denser layer of lower mantle that is much like thick molten tar.

each tectonic plate is free-floating and can move independently. earthquakes and volcanoes are the direct result of the movement of tectonic plates at fault lines. the term fault is used to describe the boundary between tectonic plates. most of the earthquakes and volcanoes around the pacific ocean basin—a pattern known as the “ring of fire”—are due to the movement of tectonic plates in this region. other observable results of short-term plate movement include the gradual widening of the great rift lakes in eastern africa and the rising of the himalayan mountain range. the motion of plates can be described in four general patterns:

collision: when two continental plates are shoved together

subduction: when one plate plunges beneath another (fig. 7.15)

spreading: when two plates are pushed apart (fig. 7.15)

transform faulting: when two plates slide past each other (fig. 7.15)