Question

1. I want to estimate the average amount of people who drink coffee in the morning....

1. I want to estimate the average amount of people who drink coffee in the morning. How many people should I poll to be 97% confident that I am within 1.5% of the actual proportion?

Part 2

Repeat , but assume the last year the polls showed that 40% drink coffee.

Part 3

I want to estimate the average amount of money that customers at Starbucks spend on purchase. How many people should I poll to be 99% confident that I am within 40 cents of the actual amount? Assume σ= %1.50.

Math   Statistics-And-Probability   
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