Fifteen out of 60 participants scored between 17 and 21 on a test. What is the relative frequency of the class interval 17-21?

The phenomenon of "temporal disintegration" is most closely associated with the use of which of the following drugs?

a. nicotine c. cocaine b. heroin d. marijuana

According to the levels of processing paradigm, how well you remember something depends on:

a) the length of time that the information is processed b) the type of processing performed on the item c) the way that memory is tested d) whether the words to be remembered rhyme or not