Scientists are pervasive ________; that is, they constantly challenge accepted wisdom in their search for more

The primary factor when editors or producers select news to present to readers and viewers is the need to __________

a. capture attention b. sell advertising c. make a political point d. change people's opinions

Threats to internal validity due to ________ are greatest when a long time has passed between pretest and posttest measurements

A) regression to the mean B) history C) effects of testing D) scoring errors Fill in the blank with the correct answer.