I | Question 20 1 pts In Question #19, if my wife had college students in the Gu

Question

I | Question 20 1 pts In Question #19, if my wife had college students in the Guardians class and Lecture only class (the two that did the best, but the other classes only contained those in the 6th Grade, which threat to internal validity would be most appropriate to call her on? O aturation , because puberty can increase science knowledge. OBSelection because the classes are very differentthus the participants in each condition are very different o C. History because the college students understand history and psychology better than the 6th graders will when they get to college. O D. Regression to the mean because the 6th graders are more extremethus they fell back toward the mean on the test. o E. No threats to validity because college students and 6th graders are at the same intellectual level when it comes to science information. 1 pts

Explanation / Answer

Answer: The main threat to internal validity come from factors and variable that confound the results due their independent influence other than experimental independent variables. One of appropriate strategy to counter this threat is to ensure that participants are same (to the extent possible) on other relevant factors (possible confounding variables) before the experimenter manipulates the experimental independent variable to observe its impact. In this case, if the classes differ significantly in their age, and academic levels that could confound the experimental result and the internal validity would be threatened. Therefore, the option B is the correct answer here.

                       

B. Selection because the classes are very different, thus participants in each condition are very different.

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