The director of the swimming program at the YFCA wanted to try out a new method of teaching. For half the summer session he told his instructors to use their usual teaching methods. Then half way through the summer he had all the instructors switch to his new method. Between the middle and end of the summer a significant portion of the students showed marked improvement. What is the independent, and dependent variable, and confound.

Independent variable: method of teaching.

Dependent variable: summer sessions.

confound variable: improvement.

Explanation:

Independent variable is described as a variable that is being manipulated and changed in order to see its effect on the dependent variable. The dependent variable is directly affected by the independent variable.

The dependent variable is described as a variable that is being tested by an experimenter in particular research or experiment.

Confound variable is determined as a "third variable" in an experiment which is responsible for examining an already existing "cause-and-effect" relationship.

28. evolution

29. environment, survive, offspring  

explanation: