Given a sample of those who did not respond to a mailed questionnaire, the main purpose for interviewing the sample is to
a. increase the size of the sample.
b. attempt to change the results that the investigator did not like.
c. discover which items were unclear to the subjects.
d. determine whether non-respondents differ from respondents.
e. determine what the non-respondents think about the questionnaire.
Question 2
Educational psychologists who are familiar with research findings
a. almost always agree on what the data indicate.
b. tend to criticize and therefore ignore the quality of the data.
c. rarely form conclusions on the basis of research findings.
d. sometimes construct different interpretations of what the data mean.
The nitrogen cycle. The five main parts of the nitrogen cycle are:
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