The phrase "a broad sample of" is correct and usable in written English.
It can be used when referring to a diverse or extensive selection of items, data, or individuals in a study or analysis.
Example: "The research was based on a broad sample of participants from various demographics to ensure comprehensive results."
Alternatives: "a wide range of" or "a diverse selection of".
Because carrion flies are notoriously indiscriminate eaters, they yield DNA from a broad sample of species.
My housing association, Hanover, was selected by the OFT as one of a broad sample of different landlords to be subject to detailed investigation.
Researchers associated with New York State University asked a broad sample of Congolese whether they thought Tutsis were Congolese.
In an interview, Professor Eisenberg of Cornell Law School, an author of the new study, said its importance was that it was based on a broad sample of actual cases, not on hypothetical cases.
Then watch what happens after he tells them what to order, the food has been delivered, and everyone begins to take bites of everything, making a broad sample of the menu.
[audio url="https://api.soundcloud.com/tracks/165365323"] The door to the café, which had annoying bells on a string, kept clattering open and shut to admit a broad sample of the community.
Much like the consumer price index, a basket of goods and services that economists use to track inflation, the measure is made up of a broad sample of keywords and is weighted to make it statistically accurate.
In her will, the single condition that she placed on the donation of the museum's collection, which included a broad sample of visual arts from around the world, was that it remain exactly as she had arranged it.
Johnson asked managers as well as a broad sample of U.S. workers about their late night habits.
The data set for empirical analysis contains a broad sample of Italian family business foundations.
To do this, instructors will need to obtain responses from a broad sample of the class.
