: 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.