題組內容

5. (總分 15 分) Is a customer's preference for a cell phone affected by the age of the customer? If so, advertising might need to target a particular age group. Suppose a random sample of 500 customers aged 16 and older was selected, and their recent purchased cell phones along with their age groups were recorded, as shown in the table below.
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(a) (10 分) Use an appropriate method to determine whether or not a customer's preference is dependent on age.