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A soap manufacturing company was distributing a particular brand of soap through a large number of retail shops. Before a heavy advertisement campaign, the mean

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

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