Question

Godrej 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 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 to be effective

Answer 1

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Answer 2

Answer:

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