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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![]() VINTAGE DAVID WHITE MODEL 8090 SURVEYING LEVEL W CASE US $29.99
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![]() David White Model 8300 Survey Transit Level 03 L83184A US $17.45
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![]() Keuffel Esser K E Level Transit Theodolite Surveying US $159.99
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![]() Lietz Sokkisha Model 200 760284 surveying level US $348.00
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![]() DS32 Automatic Level Kit Dumpy Level Kit Including Tripod Staff Surveying US $212.15
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![]() Survey Tripod Adapter 4 Transit or Level US $43.00
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![]() Vintage Antique Survey Transit Level US $100.00
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![]() Large TriPodcameralevelsurvey US $5.00
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![]() Vintage USGS US Geological Survey Green Cloth Level Book 9 903A US $7.95
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![]() DAVID WHITE SIGHT LEVEL LP6 20 HARD CASE SURVEYING EQUIPMENT CONSTRUCTION US $34.99
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Surveyors Level Reduction Spreadsheet


US $29.99







































