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A construction engineer collected data from some construction sites on the quantity of gravel (in metric tons) used in mixing concrete. The data can be

A construction engineer collected data from some construction sites on the quantity of gravel (in metric tons) used in mixing concrete. The data can be found here: 4861 5158 8642 2896 7654 9891 8381 6215 1116 7918 2313 8114 3517 8852 5712 4312 8023 1215 3598 2429 8211 4613 9168 6819 They know from previous work that the standard deviation is 2500 tons.

a) Suppose we want to make a 95% confidence interval, what is the LOWER confidence limit? Give your answer to one decimal place.

b) Suppose we want to make a 95% confidence interval, what is the UPPER confidence limit? Give your answer to one decimal place.

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