QUESTION 1 1 . An educational psychologist wanted to know the effects of four different methods of teaching arithmetic . Using 12 classrooms . each method was used in the classes . At the end of the school year , all the pupils took the same achievement test , and the means for groups receiving different methods ^were compared . Answer the following questions about the study a. What was the dependent variable ? b . What was the independent variable ? C. What was a controlled variable d Give an example of a parameter QUESTION 2 1. Identify the mean . median and mode for the following data set : Pool 18 CO 10 12 QUESTION 3 1 Identify the mean . median and mode for the following data set