Final answer:
The label 'average percentage of total sales - Splashtastic' at the top of a new column during analysis is known as a column header or column title, indicating the data in that column pertains to Splashtastic's share of total sales expressed as a percentage.
Step-by-step explanation:
The label at the top of the new column 'f' which is added during the analysis and reads 'average percentage of total sales - Splashtastic' serves as a description of the data represented in that column. This type of label is typically called a column header or a column title. In this case, the column header indicates that the data within the column will represent the average percentage of total sales attributable to Splashtastic.
In data analysis, it is important to label columns clearly to convey what type of data is being shown and in what unit of measure if applicable. Following the convention of Quantity/units, the column header informs the reader that the numerical values in the column should be interpreted as a percentage, relating to the part of total sales made up by Splashtastic. Clear labeling enhances the understandability and professionalism of the analysis.