9. In a famous experiment carried out in 1882, Michelson and Newcomb obtained 66 observations on the time it took for light to travel between two locations in Washington, D.C. A few of the measurements (coded in a certain manner) were 31, 23, 32, 36, 2, 26, 27, and 31.

a. Why are these measurements not identical?

b. Is this an enumerative study? Why or why not?