The phrase "a study investigated" is correct and usable in written English.
It can be used when referring to research that has been conducted to explore a specific topic or question.
Example: "A study investigated the effects of sleep deprivation on cognitive performance."
Alternatives: "a study examined" or "a study explored".
A study investigated the relationship between the quality of schools subsequently attended by adolescents and their preschool experience.
A study investigated the relationship between physicians' implicit and explicit biases.
In 2007 a study investigated the influence of crowd noise on referees in the English football Premier League.
A study investigated the effect of aquatic environment, as a destructive crime scene condition, on the quality of fingerprints.
A study investigated the survival after plasma treatment of the Gram-negative Escherichia coli, the Gram-positive Staphylococcus aureus, the yeast Saccharomyces cerevisiae, and Bacillus subtilis spores using helium/oxygen as a working gas.
As chitin is a structural component of fungi, which are well known for their role in environmental asthma, a study investigated whether the exposure to environmental fungi modulates the effect of chitinases in individuals with asthma.
He is the Principal Investigator of a study investigating the accuracy of such a wearable home EEG device for the diagnosis of obstructive sleep apnea.
They are the authors of a study investigating the career experiences of black and minority ethnic leaders.
Grant, of course, has conducted a study investigating whether giving behaviors at work translate into happiness at home.
Students this summer will have opportunities to be involved in a study investigating two different behavioral approaches to improving sleep to lower blood pressure.
The Neurocognition of Language Lab at Teachers College, Columbia University is seeking 8-12 year old student volunteers for a study investigating how brain activity changes as students become skilled readers.
