Identify Appropriate Statistical Tests

Suggest appropriate statistical test(s) to use for the following hypothesis/research question: '[State your hypothesis clearly, e.g., 'Is there a statistically significant difference in average customer satisfaction scores (scale 1-10) between customers who used Support Channel A versus Support Channel B?', 'Is there an association between Age Group (categorical: Young, Middle, Old) and Product Preference (categorical: P1, P2, P3)?', 'Does marketing spend (numerical) predict sales revenue (numerical)?']'.
My key variables are: [Describe variables and their types: numerical, categorical (binary/multi-level), ordinal].
**Note:** Recommendations are based on common practice. Verify test assumptions before applying.