Aresearcher has recently completed a mail survey for which the response rate was less than 10%. as the returned data from the survey are analyzed, the researcher wonders whether those who responded to the survey may have been somehow significantly different from those who did not respond. and could these differences have skewed the results of the survey?

Which of the following selections is least useful for supporting the claim that states intentionally built unequal school systems? question 1 options: the supreme court ruling in plessy v. ferguson (1896) wrote into law that america had two separate societies: one black and one white. it was very clear by the mid-1900s that southern states had expertly built separate educational systems. these schools, however, were never equal. states with laws keeping schools segregated never gave equal amounts of money to their black and white schools. ten years after brown, fewer than 10 percent of southern public schools had integrated. some areas did not comply at all.