All of the research confirms that ________ continue to be the most influential factor in a teenager's drug use, especially in the use of alcohol and tobacco

Punishment works best when it is administered hours after an undesired behavior occurs

Indicate whether the statement is true or false

When 100% of the test-takers get an item correct, the item will have a

a. low difficulty index (0%). b. high discriminability index. c. discriminability index of approximately .5. d. very low discriminability index.