Part a add single electrons and/or electron pairs as needed to complete the electron-dot symbol for astatine, at. to return the atom to its original state, use the reset button. click to select an electron-pair or single electron, then click on the element symbol to add electrons. click the reset button to clear all electrons and start over. view available hint(s) aannn

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.