If a new process for mining copper is to be put into full-time operation, it must produc...

If a new process for mining copper is to be put into full-time operation, it must produce an average of more than 50 tons of ore per day. A 15-day trial period gave the results shown in the accompanying table.

a. Estimate the typical amount of ore produced by the mine using both a point estimate and a 95% confidence interval.

b. Is there significant evidence that on a typical day the mine produces more than 50 tons of ore? Test by using α = .05.