Scales of measurement are important because

Scales of measurement are important because
 
  a. they influence the kinds of statistical tests we will use in at least a crude way.
  b. they reflect the kinds of statements we may make about relationships between points on the scale.
  c. they limit the kinds of conclusions we can draw from a study.
  d. all of the above

Question 2

In which of the following experiments could we NOT use random assignment?
 
  a. a comparison of groups receiving three different levels of a drug
  b. a comparison of driving errors with and without consuming alcohol
  c. the comparison of people from several religious groups in terms of acceptance of others' beliefs
  d. None of the above could use random assignment.