Question: If adding a squared term of the rainfall variable in a regression model between rainfall and umbrella sales results in a negative and significant coefficient

If adding a squared term of the rainfall variable in a regression model between rainfall and umbrella sales results in a negative and significant coefficient for the squared term, we may infer that

Select one:

a. After rainfall exceeds a certain level, umbrella sales decrease as rainfall increases

b. There exists no relationship between rainfall and umbrella sales

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