When a report is based on data from a large number of sessions, you may see the following notice at the top of the report: "This report is based on N sessions." You can adjust the sampling rate of the report by:

Google Analytics IQ exam: Questions & Answers  (updated for 2016).

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When a report is based on data from a large number of sessions, you may see the following notice at the top of the report: "This report is based on N sessions."  You can adjust the sampling rate of the report by: