Research has reported that ________ in families that lack ________ (families in which members are not committed to providing support to each other) are more at risk for ADHD than are ________ siblings in such families

The use of _____ represents the most commonly abused illegal drug in the United States

Fill in the blank with correct word

Researchers have conducted nearly 300 split cable market tests to assess the effectiveness of advertisements. In these tests, cable viewers are randomly assigned to receive advertisements for new or existing products, and

a. they are interviewed by phone to see if they purchased the products. b. store scanners are used to track their purchasing patterns. c. stores provide them a checklist of commercials and ask if they've seen them. d. researchers come to their homes to do an inventory of their kitchens.