Final answer:
The statement that EV is an acronym for 'expected variable' is false; EV stands for 'expected value,' the long-term average or mean of a random variable. A hypothesis is similar to a 'suggestion', and a variable's value can change over time. In circuit diagrams, the voltage is not constant at every point in the wire.
Step-by-step explanation:
EV is not an acronym for 'expected variable.' This statement is false. The term EV often stands for 'expected value,' which in statistics is the long-term average or mean value of a random variable. For example, in the given scenario of tossing three coins, the expected value (EV) would be the average number of heads obtained over a large number of coin toss trials.
From the given question options, the word closest in meaning to hypothesis is 'suggestion' because a hypothesis is a proposed explanation made on the basis of limited evidence and is a starting point for further investigation.
For the other questions: Voltage is indeed often referred to as potential difference, which makes the statement true. In a scientific experiment, a placebo might be administered to control for the effects of participant expectation, which would categorize it as an independent variable. A variable is best described as something whose value can change over multiple measurements. Lastly, it is false to assume that the voltage is the same at every point in a given wire in a circuit diagram.