All three effects (fatigue, practice effect, and carryover effect) are important issues related to time sampling error. Fatigue refers to a decrease in performance due to exhaustion, boredom, or distractions. Practice effect refers to the improvement in performance due to repeated testing or practice. Carryover effect refers to the influence of a previous task on a subsequent task. Failing to control for these effects can lead to inaccurate or unreliable data. Therefore, it is essential to minimize time sampling error to ensure the validity and reliability of research findings.