According to a longitudinal sleep study begun in 1982, people sleeping this average number of hours per night are much less likely to have died

Infomercial that offer not only the product they are selling but also additional product at no additional cost are using the ______ technique.

a. low-balling b. foot-in-the- door c. that's-not-all d. door-in-the-face

A disadvantage of experimental research is that it does not permit identification of cause and effect

Indicate whether this statement is true or false.