Irina's basketball team has a 1 in 6 chance of winning the first-place trophy. She rolled a six-sided number cube repeatedly, assigning her team a number between 1 and 6 to demonstrate the probability that her team would win. Which method did she use to collect her data?

The method she use to collect her data is called observational study. observational study is used when independent variable can not be controlled due to some circumtances, and by drawing a conclusion by comparing it to a control group. which in her case is the six-sided number cube.