How did the experiment test the hypothesis?

The experiment tested the hypothesis by systematically manipulating one variable while controlling for others to observe its effect on the outcome. Data was collected through measurements or observations that were then analyzed statistically to determine if the results supported or refuted the hypothesis. By comparing the experimental group with a control group, the researchers could assess the impact of the variable in question. This approach allowed for a clear evaluation of the relationship between the manipulated variable and the observed effects.