6. The supply manager at a local ice cream shop claims that 80% of customers prefer chocolate over vanilla. One of the employees
believes that is an overstatement. He selects a random sample of 50 customers and found that 30 of them preferred chocolate over vanilla. Which of the following is the appropriate margin of error for a 95 percent confidence interval to estimate the population proportion of all customers that prefer chocolate over vanilla? 
1 answer:
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