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An A soap manufacturing company was distributing a particular brand of soap through a large number of retail shops. Before a heavy advertisement compaign,
An A soap manufacturing company was distributing a particular brand of soap through a large number of retail shops. Before a heavy advertisement compaign, the mean sales per week per shop was 140 dozens. After the campaign, a sample of 26 shops was taken and the mean sales was found to be 147 dozens with standard deviation 16. Can nsider the advertisement effective?
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