chuck is vice president of claims for insurance company. the company has 37 adjusters in the field, and needs to hire four new adjusters. chuck is curious about the relationship between prior experience of the adjuster and policyowner complaints. he collected data on the number of complaints for each adjuster on staff over time. then he used a statistical technique to analyze the relationship between adjuster experience and complaints, and the trend of the relationship over time. the statistical analysis confirmed that that there were significantly fewer complaints with more experienced adjusters, and that the relationship grew stronger with more years of experience. the technique chuck used to relate indicators to outcomes is called