Me! two groups of students were tested to compare their speed working math problems. each group was given the same problems. one group used calculators and the other group computed without calculators.

1.) what is the independent variable?

2.) what is the dependent variable?

3.) what is the constant variable?

Ineed ! it’s science and it’s due tomorrow!

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.

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer