In the following table,individuals are cross-classified by their age group and income level. 
To test that age group and income are independent,the null and alternative hypothesis are _________________________________________________________________________.
Definitions:
Seasonal Effect
A pattern observed in time-series data where changes occur at regular intervals due to seasonal factors.
Delphi Method
A structured communication technique, originally developed as a systematic, interactive forecasting method which relies on a panel of experts.
Comparative Analysis
The process of comparing two or more items, such as data sets, statistical results, or models, to identify their similarities and differences.
Simple Exponential Smoothing Model
A forecasting technique that applies smoothing constants to previous observations, typically used for time series data without trend or seasonality.
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