CHES Practice Test 4

10 free CHES practice questions in the real exam format, covering the official content areas, with an explanation for every answer.

CHES Practice Test 4Tutor mode

Question 1 of 10

Evaluation

A community center evaluates a 12-week program to cut sugary drink intake among adolescents, using a one-group pretest-posttest design. During the program, the local school district removed sugary drinks from vending machines in all its schools. Posttest intake dropped sharply. Which threat to internal validity is MOST likely?