The University of North Carolina is conducting a study on the average weight of the many bricks that make up the University’s walkways. Workers are sent to dig up and weigh a sample of 421 bricks and the average brick weight of this sample was 14.2 lb. It is a well-known fact that the standard deviation of brick weight is 0.8 lb.
- Find the standard error of the mean.
- What is the interval around the sample mean that will include the population mean 95.5 percent of the time?
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