Sally and juan’s science teacher has challenged her students to build a paper airplane that would stay airborne for ninety seconds. the students have two days to design and test their planes. the assignment will end with a "fly-off."

the teacher has given the students the problem. what is the next step in the technological design process?
a) building a model airplane
b) testing the model airplane
c) designing the model airplane
d) doing research on airplane design

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.