: it is 1. Student's method does not apply. However, the probability distribution of the average of the measurements follows the normal curve, so the normal curve method will give us a 95% confidence interval. The SE of the sum of the measurements is 1 x the square root of 2 = the square root of 2. The SE of the average of the measurements is the square root of 2 / 2 = 1/the square root of 2
= .7 .
A 95% confidence interval is given by
16 +/ (2 x .7) = 16 +/ 1.4,
which runs from 14.5 to 17.5 pounds.