A university alumni office conducted a survey of their alumni to assess changes in attitudes toward the university over time.In the first year of the survey,the alumni office surveyed graduates from the year 2009.In the second and third years of the survey,graduates from the years 2011 and 2013 were surveyed,respectively.When examining the results of the survey to determine whether attitudes of the alumni changed over time,the alumni office should consider

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The alumni office surveyed different cohorts of graduates (2009, 2011, 2013) in each year of the survey, which means the samples are not directly comparable across time. This noncomparability can affect the interpretation of changes in attitudes over time.

A University Alumni Office Conducted a Survey of Their Alumni