Identify the level of measurement (nominal, ordinal, or interval) in each of the following items:
a. American psychologist William Sheldon developed the idea that there are three major body types: ectomorph, endomorph, and mesomorph.
b. In a study of short-term memory, a psychologist measures in seconds the time it takes for participants to remember words and numbers that were told to them an hour earlier.
c. The same psychologist then groups the participants according to how good their short-term memory is, distributing them into five categories that range from “Very good short-term memory” to “Very poor short-term memory.” Participants in a sturdy about eating disorders are asked how many times they eat per day.
d. Based on blood pressure readings, a psychologist ranks the stressfulness of various activities on a scale of 1 to 10, with 1 being the least stressful and 10 being the most stressful.
e. In a study on color blindness, a psychologist counts the number of times that\ participants are able to identify the colors red, yellow, and blue in order to categorize them as either color blind or not color blind.
f. A researcher interested in family relations focuses on the birth order of siblings.