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Indication a Change Significant at the 1% Level

It is known 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 1% level.

I need to know what equation would be used and the detail of the answer to this equation.

Solution Summary

Solution attaches a Word file showing the calculations to find the equation for the given marketing data in order to conclude whether or not there is significant change.