How can a scientist best reduce the likelihood of reporting random errors in his measurements or data? a. the scientist should round all of the data to the nearest whole number to increase precision. b. the scientist should avoid using control groups, so there's no standard with which experimental data has to be compared. c. the scientist should perform one experimental trial and then eliminate any outlying data. d. the scientist should repeat the experiment several times to see if the same data is produced each time.