A researcher is interested in whether moods vary by the day of the week. She codes the postings on thousands of Facebook pages to see whether people express more positive comments on some days than...

A researcher is interested in whether moods vary by the day of the week. She codes the postings on thousands of Facebook pages to see whether people express more positive comments on some days than others. Which research method has she used?

a. Ethnography

b. Survey

c. Experimental method

d. Archival analysis