A random sample of 45 door-to-door encyclopedia

Reference no: EM13615412

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 mu, the time it takes an encyclopedia salesperson to talk to a potential customer.

What is the upper confidence limit?

Reference no: EM13615412

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