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 a = .05.

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Day Yield (tons) 57.8 58.350.3385 47.9157.0 38.6 140.2 39.3 138.7 49.2 139.7 48.3 592 49.7 1 2 3 4 5 6 78910 12 13 14 15