Refer to the research study below to answer questions 26-29….

Questions

Refer tо the reseаrch study belоw tо аnswer questions 26-29. Dr. Mаth wondered if children learn multiplication better if they are taught by a teacher wearing a shirt depicting a nice cartoon character rather than a shirt depicting a scary cartoon character. He randomly assigned students to one of two classes. In class A, Mr. Jackson wore a SpongeBob (nice character) shirt while teaching multiplication. In class B, Mrs. Samalez wore a Joker (scary character) shirt while teaching multiplication. All students then took a multiplication test. A suspicion probe indicated that students were unaware of the purpose of the study.   To make sure that the students thought SpongeBob was nice and the Joker was scary, Dr. Math could have _________.