6 А
Which one of the following statements about solar energy is false?
Solar energy comes from the Sun and travels to Earth in waves.
Solar energy does not require a medium through which to travel. This is why it can travel throug
space.
Solar energy is always available; even at night or when dense cloud cover is present.
D Solar energy is a very clean energy source, producing no air or water pollution.
B
С

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.