Why do scientists typically design experiments that will yield quantitative results?

Why do scientists typically design experiments that will yield quantitative results?
 
  a. Scientists are unable to perform qualitative studies.
  b. Quantitative results minimize the potential for bias.
  c. To prevent other scientists from repeating their experiments.
  d. Scientists cannot always observe all individuals of a group.
  e. Quantitative results increase desirable bias.

Question 2

What practice helps scientists avoid bias in their findings?
 
  a. designing experiments that other researchers will find difficult to replicate
  b. performing experiments testing all circumstances
  c. reaching conclusions based on personal conviction
  d. avoiding questions that may be at odds with societys moral standards
  e. publicly publishing their results