10 male and 10 female participants of the same age
Portable (wrist) blood pressure monitor
For this experiment, the independent variable is the color displayed on the computer screen. The dependent variable is the blood pressure of the participating individuals. This is determined by using the portable wrist blood pressure monitor. The constants (control variables) are the rest period in between viewing the monitor and length of time viewing the monitor.
The computer is programmed to show screens of blue, red, black, white, green and yellow. You can set this up by using software such as Microsoft Powerpoint.
The participants are brought into the room and allowed to relax. All their blood pressure readings are taken and recorded after 30 minutes.
The 1st participant is seated in a comfortable chair in front of the computer monitor. The computer screen is set to blue color. The participant is asked to stare at the monitor screen for 3 minutes. After 3 minutes, the participant blood pressure is measured.
The 1st participant is allowed to rest for 15 minutes before procedure 2 is repeated with the screen set to red, black, white, green and then yellow. All of the measurements are recorded.
Procedure 4 and 5 are repeated with the remaining 19 participants and their blood pressure readings are recorded in the table below.