For this experiment, the independent variable the type of water used to water the bamboo plant specimens. The dependent variable is the rate of growth of the bamboo plants. This is determined by measuring the average height of the 5 bamboo plants in each group. The constants (control variables) are the number of times the plants are watered, the amount of water used and the type of plant and soil used.
The bamboo plants are divided into 3 groups with 5 plants in each group. They are labeled as group A, group B and group C.
Group A plants are watered with tap water twice a day.
Group B plants are watered with sea water only once on the 1st day. Subsequently the plants are watered with tap water twice a day.
Group C plants are watered with sea water twice a day.
The bamboo plants are watered as mentioned above and observed for 5 days. Their height is measured everyday and recorded in the table below.