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Credence issue with Box Plot Generator

I’m a student and I was working on my Mathematical project. I’ve used the Box Plot Generator right here. The performance and output is smooth and aesthetically pleasing.

However, I’ve having one little problem. My project requires that whatever external sources I use for diagrams, I provide sufficient evidence for its credibility. I’m not very familiar with this website overall and I was wondering if there was a way to see who created that tool and their background.

Thanks in advance.

Here’s some information about the company: