Secondary Data has been - collected by someone else. Historical data in this case., Accurate  means that you - that the data was collected correctly.  Do we know this?, Primary Data has been - collected by yourself or team. - you go to SH and measure it  , Fair  means you - use the same method to measure each spit., Valid means it has - the data used would prove if this spit always grew outwards.  , Reliable  means that you - ensure that data has been collected consistently. How would we know?, An advantage of this method was - it was simple, consistent and I knew what to do.  No other way. ,

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