JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I would like to suggest checking a Visual Report tool, please see the next guide.
You can create visual reports with charts based on the form questions, and embed created reports to your web pages.
Please note that your current Matrix field type, does not compare results between selected items. The charts will be different for each item (candidate).
As an alternative to the Matrix field, you might consider a Radio Button field type (user can select one item), or a Check Box field type (user can select multiple items).
Visual report with a chart based on the Radio Button.
If you need any further assistance, please let us know.