To answer the question, "How do students in the United States pay for their higher education?", a questionnaire was sent out to collect 100 responses from randomly chosen universities in California. Is the sampling method biased or unbiased and why? Biased, since all higher education institutions are represented Biased, since every state will be represented in the sample Unbiased, since a questionnaire was used Biased, since those chosen in the sample may be systematically different than those who were excluded