Arthur has developed a hypothesis and now is designing a study to test it. which of the following can provide the best guidance regarding his choice of measures, types of data to be collected, and methods for interpreting the data?

Since Arthur has developed a hypothesis and now is designing a study to test it, the answer which can provide the best guidance regarding his choice of measures, types of data to be collected, and methods for interpreting the data is the scientific literature in his area of interest.
Books and other research can help Arthur a lot when it comes to testing his hypothesis, because perhaps there have been other similar experiments that may aid him in putting his to the test.

Your answer is c. explanation: plasma  is the fourth state of matter, derived from the gaseous state of matter.  plasma  can contain free  electrons  and/or  ions. while  plasma is never neutral, it can either be positively or negatively charged.  gases, however, are electrically neutral.

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