Answer:
Linda assigning people different bowl size is the Independent Variable
Step-by-step explanation:
Linda is conducting an experimental research , analysing the effect of pasta bowl size on pasta consumption.
The causal variable in a research is an independent variable. And, the variable effected by the independent (causal) variable is the dependent variable.
In this case, pasta serving bowl sizes (quantity) are changed to observe & analyse their impact on amount of pasta eaten by people. Hence :
- Pasta serving bowl size (quantity given) is the independent variable, as it affects amount of pasta eaten
- Quantity/ amount of pasta eaten is the dependent variable, as it is effected by pasta serving bowl size (quantity)