: 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.