In order to determine if treatment X is successful in improving eyesight, a research study was conducted.
From a large population of people with poor
eyesight, 300 participants were selected at random.
Half of the participants were randomly assigned to
receive treatment X, and the other half did not
receive treatment X. The resulting data showed that
participants who received treatment X had
significantly improved eyesight as compared to those
who did not receive treatment X. Based on the
design and results of the study, which of the
following is an appropriate conclusion?