Example Problem #4 (Margin of Error)

Example:

You are a business surveying your current customers. You've run a study with a randomly selected sample of 1,000 people from your CRM list. The results tell you that of these 1,000 customers, 52% (520 people) are happy with their latest purchase, but 48% (480 people) are not - yikes.

You want to add a margin of error to these results when you report them to your shareholders. Please calculate.