Which study approach gives the researcher control over items like selection of a source population, and the content and wording of a questionnaire?

Primary studies.

Explanation:

The study approach which gives the researcher control over items like selection of a source population, and the content and wording of a questionnaire is known as primary studies.

A primary study is a research methodology that is typically focused on having the researcher collect data directly rather than being dependent on a research that was conducted earlier or previously.

This ultimately implies that, a primary study avails a researcher the opportunity to own and have dominion or control over the entire research process.

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explanation:

daily refers to frequency, like weekly or monthly. take this medicine twice daily, once in the morning and again at bedtime. on a daily basis there refers to everyday life, to one's normal or usual behavior, activity, routine, or schedule, to the quotidien.