Reading disorder is more common in boys than in girls

A researcher who studies a fixed group of people over a long period of time is, by definition, using the __________

a. longitudinal method b. correlational method c. cross-sectional method d. case study method

Your best friend passes you in the school hallway and glares at you without speaking. You think, "Now, why did she do that?" One possible explanation could be that she saw you flirting with her boyfriend

Within the framework of the scientific method, this possible explanation for your friend's behavior will remain tentative until it is tested by your asking your friend why she did not speak. Thus, this tentative, possible explanation would be considered a. theory. b. operational definition. c. hypothesis. d. relative certainty.