Answer:
10 levels
Explanation:
The study aimed at studying the effect of scenarios on anchoring and adjustment. The test scenarios are 10 and are the independent variables while anchoring and adjustments are the dependent variables.
Since the participants are subjected to reading 10 scenarios, the levels of the independent variables are 10. For example if i were to study the effect of 3 nitrogen levels on crop yields, the levels of the independent variable will be 3.