How do I get people to act on the data instead of their gut?

You can present the results cleanly now. The hard part is what happens after: people nod, and then go do what their gut told them anyway. That is maddening when the evidence is right there in front of them. But people rarely change course because of numbers alone. They change because the numbers connect to something they already feel. A gut feeling is a story someone believes about how the world works. You will not beat a story with a spreadsheet. You beat it, or better, you join it, with a clearer story that happens to be backed by your data. Facts inform. Stories move. You need both, and you have been leading with only one. Next time, before you show the chart, tell them what it means for something they care about. Make it concrete: this decision costs us this, or wins us that. Give the number a face and a stake. When people can feel what the data is saying, not just see it, that is when they finally act.