Table 18.1 summarizes purchases at Amazon made by a sample of 555 visitors of varying income who bought either a camera or a mobile phone (but not both).
|Less than $25,000||$25,000 to $49,999||$50,000 to $74,999||$75,000 to $99,999||$100,000 or more|
The association evident in this contingency table suggests that income and choice are dependent. Households with lower incomes are more likely to purchase a phone, whereas higher-income households are more likely to purchase cameras. Almost 3/4 of those with estimated ...