A Random Sample of 45 Door-To-Door Encyclopedia Salespersons Were Asked

Short Answer

A random sample of 45 door-to-door encyclopedia salespersons were asked how long on average they were able to talk to the potential customer. Their answers revealed a mean of 8.5 minutes with a variance of 9 minutes. Construct a 95% confidence interval for , the time it takes an encyclopedia salesperson to talk to a potential customer.
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