SHORT ANSWER. Answer all questions completely showing all work to support your responses. Please be n presentation. 1) A quality control specialist compares the output from a machine with a new lubricant to the output of machines with the old lubricant and found a 65% improvement. a) Determine whether the study is an experimental or an observational study. b) Identify the sample and the population. 1). c) Is the value 65% a statistic or a parameter? d) Identify any one major problem with that study.