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  • 14-06-2017
  • Mathematics
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A grocery store chain has been tracking data on the number of shoppers that use coupons. The data shows that 71% of all shoppers use coupons. 18 times out of 20 these results were considered accurate to within 2.5%. What is the confidence level?

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  • 14-06-2017
What's the sample size?
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