Can you alter/ change the results of a Survey? Further can you alter the appearance to not show a pie chart?
You can delete responses. Check out the Help Documentation here:
There is not a directly means for aggregating data from multiple surveys. I often do this outside of SurveyGizmo in Excel. If you have multiple identical surveys, you could consider making a copy of one of them as a ‘Master Copy’ and you could use the Data Import tool to import data from the other survey into it:
Can you delete the individual responses so that they do not show? Further can you aggregate survey results taken from multiple surveys?
You can certainly change your pie charts to bar graphs (for compatible question types). You can view the different options available for pie charts in Standard Reports, here:
I’m not entirely sure what you mean by changing the results of your survey, so perhaps you can clarify?