Aresearcher wants to know what the average variation is in altimeters of small, privately owned airplanes. the task of determining this is expensive and time consuming, if even possible, given the large number of such airplanes. the researcher decides to use government records to randomly locate the owners of ten such planes and then get permission to test the altimeters. when the researcher is done, he will use the data gathered from the group of ten to reach conclusions about all small, privately owned airplanes. this process can best be described as descriptive statistics data statistics inferential statistics research statistics nonparametric statistics