"We have extra accounts for our survey. This is causing the Response Rate to be lower than it should. Will this affect my school's reported results?"
The survey Response Rate does not have any impact on results. The only area that you will notice is in the Monitor Progress screen where it will register a lower value. The Response Rate is meant to be used as a guideline for when to close the survey but it's not a rule that must be followed. The surveys Completed To Date is a more accurate measure of survey progress.
Only survey accounts that have logged in and submitted results will be used to calculate the summary reports and charts. Extra or unused accounts are not factored into the results.