A teacher wants to check if students have mastered instructional objectives at the end of a unit. What type of assessment should they use?

Using an achievement test at the end of a unit is appropriate for assessing whether students have mastered the instructional objectives. Achievement tests are specifically designed to evaluate what students have learned in a certain subject area or after completing a specific instructional period. They often cover content that aligns with learning objectives, providing a clear indicator of how well students have grasped the material.

Formative assessments, on the other hand, are used throughout the instructional period to monitor student learning and provide ongoing feedback. They help inform both teaching and learning but are not ideal for evaluating mastery at the end of a unit.

Diagnostic assessments are aimed at identifying students' strengths and weaknesses before instruction begins. They help in tailoring instruction but are not used to measure the outcomes of learning after a unit has been completed.

Peer assessment involves students evaluating the work of their classmates. While this can provide valuable insights and feedback, it does not systematically measure the achievement of specific learning objectives in the same way that an achievement test does.