Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. 6) Ages of survey respondents. 7) Amount of fat (in grams) in cookies. 8) The subjects in which college students major. 9) Survey responses of "good, better, best". 10) Nationalities of survey respondents. 11) The sample of spheres categorized from softest to hardest.

Ages of survey respondents would fall under the ratio level of measurement because age has a true zero point (age 0 represents the absence of age) and allows for meaningful comparisons, such as someone being twice as old as another. As for survey responses of "good, better, best," this represents the ordinal level of measurement. While we can rank these responses in order of quality, the exact differences between each category are not quantified. This means we know "best" is better than "good," but we can't say how much better!