Multiple Choice Selectively cutling down trees on an area of land can be best described as
A. culting down certain trees while leaving other trees standing.
B. cutting down all of the trees and smaller plants.
C. cutting down none of the trees on the land.
D. cutting down all of the trees while leaving all other plants standing.

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.