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Ar A soap manufacturing company was distributing a particular brand of soap through a large...

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Ar 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 you consider the advertisement effective MUGLL 660 LOUD

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