The average American family had completed only 41.6% of its back-to-school shopping as of August 11, according to the National Retail Federation's latest Back-to-School/College Consumers Intentions and Actions survey. The survey, which was conducted by BIGresearch, polled 8,543 consumers from August 4-11. Families of college students had completed 41% of their shopping by early August and 30.5% of families with school-aged children hadn't even started their shopping.