Historically 20% of potential customers bought a certain brand of soap. To increase sales, the company used an extensive advertising campaign. At the end of the campaign, a sample of 400 customers was surveyed and it was found that 92 had purchased the company's soap. Does this indicate that the proportion of customers of this brand of soap has increased, at the .1 level?
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Historically 20% of potential customers bought a certain brand of soap. To increase sales, the compa...
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