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The Pizza Shop wanted to determine what proportion of its customers ordered only cheese pizza. Out...

The Pizza Shop wanted to determine what proportion of its customers ordered only cheese pizza. Out of 80 random customers surveyed, 20 ordered cheese pizza.

What is the 95% confidence interval of the true proportion of customers who order only cheese pizza.

Correct answer: 0.1551 < p < 0.3449

How does one obtain this answer (using a standard TI-84 Plus calculator), and why is this the correct answer?

math   Statistics-And-Probability   
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