Mathematics, 24.02.2020 18:52 cheezloord8472
An economist conducted a study of the possible association between weekly income and weekly grocery expenditures. The particular interest was whether higher income would result in shoppers spending more on groceries. A random sample of shoppers at a local supermarket was obtained, and a questionnaire was administered asking about the weekly income of the shopper’s family and the grocery bill for that week. The gender of the shopper was also obtained. The correlation was found to be r = 0.649 . The amount of variation in the response explained by the regression line is: 0.421 %. 64.9 %. 42.1 %. 0.649 %.
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