Discuss what is meant by the precision of an observation? A distance AB is observed repeatedly using the same equipment and procedures, and the results, in meters, are listed below. Calculate 65.401, 65.400, 65.402, 65.396, 65.406, 65.401, 65.396, 65.401, 65.405, and 65.404. 

Calculate: 

(a) the line's most probable length, 

(b) the standard deviation, and 

(c) the standard deviation of the mean. 

(d) the 90% confidence interval range (mean +/-_) 

(d) the 95% confidence interval range (mean +/-_)