Level Surveying
Does the example indicate a change significant at the 5% level?
It is believed that 40% of retail outlets in a certain area stock your product. An intensive marketing campaign is carried out, after which a survey of 80 outlets shows 41 stocking the product. Does this indicate a change significant at the 5% level?
Well, after the campaign (41/80)*100 = 51.25% of shops are stocking it. That's an increase of 11.25%, but the actual percentage change is (11.25/40) = 28.13%.
I don't quite know what significant at the 5% level means, but I assume this is significant at that level seeing as it's greater than 5%.
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Surveyors Level Reduction Spreadsheet
