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The manager of a local fast-food restaurant is concerned about customers who ask for a water cup when placing an order but fill the cup with soft

The manager of a local fast-food restaurant is concerned about customers who ask for a water cup when placing an order but fill the cup with soft drink from the beverage fountain instead of filling the cup with water. The manager selected a random sample of 80 customers who asked for a water cup when placing an order and found that 23 of those customers filled the cup with a soft drink from the beverage fountain.


Construct and interpret a 95% confidence interval for the proportion of all customers who, having asked for a water cup when placing an order, will fill the cup with soft drink from the beverage fountain.

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