Which research method provides the best way of assessing whether cigarette smoking boosts mental alertness?

The answer is "the experiment".

An experiment is a method completed to support, discredit, or approve a hypothesis. Experiments give understanding into circumstances and end results by exhibiting what result happens when a specific factor is controlled. Experiments differ significantly in objective and scale, yet dependably depend on repeatable method and coherent examination of the outcomes. There additionally exists regular exploratory examinations.

well, paralell is parallel. i am providing links to .

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a series circuit is one with all the loads in a row. there is only one path for the electricity to flow. if this circuit was a string of light bulbs, and one blew out, the remaining bulbs would turn off.

unlike in series circuits, a charge in a parallel circuit encounters a single voltage drop during its path through the external circuit. the current through a given branch can be predicted using the ohm's law equation and the voltage drop across the resistor and the resistance of the resistor.

a parallel circuit has certain characteristics and basic rules: a parallel circuit has two or more paths for current to flow through. voltage is the same across each component of the parallel circuit.