Mathematics, 10.12.2021 03:30 jblac

The manager at the local Ruby Tuesday's restaurant wanted to investigate the effect of music on the average revenue per customer. Each night for one month, fast- paced music was played. The following month, slow- paced music was played every night. The average revenue per customer for each month was compared. This method of gathering data is known as: a. surveys
b. experiments
c. focus groups
d. direct observation

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