A sociologist conducts a survey to determine the effects of family size on various aspects of life. For each of the following questionnaire items, identify the level of measurement (nominal, ordinal, or interval):
a. Does family size affect school performance? Students are asked to circle their letter grade (A,B,C,D, or F) in various school subjects.
b. Does family size differ by socioeconomic status? Parents are asked to provide their yearly income in dollars.
c. Does parental health differ by family size? Parents are asked to rate their overall health on a scale from 1 go 5, with 1 being in very good health and 5 being in very poor health.
d. Do the effects of family size differ with race and ethnicity? Respondents are asked to indicate if they are Black, White, Hispanic, or other.