A researcher sends out 2,000 questionnaires via e-mail and promises respondents anonymity. Fifty surveys are returned because the e-mail addresses are inaccurate. Of the 1,950 delivered questionnaires, 100 are completed and e-mailed back. However, 40 of these respondents wrote that they did not want to participate in the survey. The researcher indicates the response rate was 5.0 percent. Is this the right thing to do? What concerns might you have about this approach?