defect rate was $7$ defects $/$ square inch. A project was undertaken by the process excellence department to reduce the defect rate to $3$ defects$/$square inch. After one month of implementation of the revised strategy as a part of performance improvement plan, the team plans to check if the error rate target has been achieved. The performs $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ test for validation.