Question: Its commonly believed that people use tips to reward good service. A researcher for the hospitality industry examined tips and ratings of service quality from

It’s commonly believed that people use tips to reward good service. A researcher for the hospitality industry examined tips and ratings of service quality from 2645 dining parties at 21 different restaurants. The correlation between ratings of service and tip percentages was 0.11. (M. Lynn and M. McCall, “Gratitude and Gratuity,” Journal of Socio-Economics 29: 203–214)
a) Describe the relationship between Quality of Service and Tip Size.
b) Find and interpret the value of R² in this context.

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