If an author with the above credentials wrote an article titled "conducting primary research," would you consider it a credible source?

yes, the author has studied and published within the topic.
yes, the author has a phd.
no, the author did not get a degree in research.
no, the author does not have research background.

yes, the author has studied and published within the topic. e2020 answer

faulty parallelism is a construction in which two or more parts of a sentence are equivalent in meaning but not grammatically similar in form.

the correct version of this faulty parallelism in the sentence is:

the hikers knew that the hike was six miles, that it usually required the entire day, and it would not be wise to start after 10: 00 a.m.

the problem is the last sentence, the first two have a basic subject+verb+object structure.

so, to give a proper balance to the structure, or better said, to give a parallel structure, we must write a basic s+v+o structure in all three sentences:

the hikers knew that the hike was six miles, that it usually required the entire day, and it would not be wise to start after 10: 00 a.m.

you need to add more so i can you