Answer: Point estimate
Explanation: When working on the sample population which involves taking at random, a part of the entire population which is representative of the whole population distribution, when only a single value is obtained from the sample distribution to serve as the best estimate or guess about the population parameter, this is called a POINT ESTIMATE. In the scenario above, using a sample size of 38, a single point estimate of 6.8 milliseconds was obtained as the average slow time when coherence breaks while reading. The 6.8 millisecond obtained is the population parameter.