A university alumni office conducts 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 surveys graduates from the year 2007.In the second year of the survey,graduates from the year 2009 are surveyed.The results of the survey indicated very different attitudes of the alumni.The alumni office concluded that attitudes toward the university changed over time.This conclusion

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The conclusion that attitudes toward the university changed over time may be inaccurate because of the problem of noncomparable samples. The alumni from the two different years may have different characteristics and experiences that could affect their attitudes toward the university, making them not comparable. This may lead to incorrect conclusions about changes in attitudes over time.

A University Alumni Office Conducts a Survey of Their Alumni