Answer:
The type of DSS analysis is Tanner performing is sensitivity analysis (what-if analysis)
Explanation:
Sensitivity analysis can be referred to as the study of how the variability and doubts in the results of a model or can be distributed to different sources of variability and doubts in its inputs.
The model mentioned above is expected to be a mathematical model as it deals with numerals and figures.
Tanner's analysis has to do with sales and revenue generation (mathematical model)
Also, the sensitivity model an analytical technique by performing logical reasoning to influence the expected results when certain changes are applied to the parameters of or the activities in a process.