Whether the currently selected calibration stimulus type is the calibration curve

        :returns: boolean -- if the current combo box selection is calibration curve

def isToneCal(self):
        """Whether the currently selected calibration stimulus type is the calibration curve

        :returns: boolean -- if the current combo box selection is calibration curve
        """
        return self.ui.calTypeCmbbx.currentIndex() == self.ui.calTypeCmbbx.count() -1