Students select or create their own hypotheses on reaction time. There are blank lines for students to write an additional hypothesis about reaction time. Brainstorm additional ideas with the class; however, be sure to approve any student-generated scientific hypotheses.
Students should work with a partner or in a small group to select a hypothesis that they think is true or to create their own.
Partners create a procedure for testing their hypothesis. A sample procedure is included. Ask students if they see anything wrong with the procedure. Point out that by doing Version 1 first each time, the variable of practice is introduced.
Review the necessary elements for creating a hypothesis using the four examples from the list. Do each of these express a view about reaction time and can the reason or cause be tested with a measurement? In each case, the answer is yes.
Remind students of what is necessary for a fair test as they write their procedure. Since they added a variable (in the sample procedure, the added variable was hearing the word “go”), they have to be sure to design a procedure that controls for the new variable.