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Refer to the research study below to answer questions 26-29. Dr. Math 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.   What kind of design is this?

Which of the following is a threat to internal validity found in a within-groups design but NOT an independent-groups design?

A researcher in theory-testing mode focuses on ________, while a researcher in generalization mode focuses on ________. 

Which of the following variables would be the best independent variable in an experiment? *Hint: think ethically and plausibly

Dr. Factors is conducting a 2 x 4 factorial design. How many factors are in his study?

In the case of a factorial design, another term for independent variable is _________.

A researcher finds that for female applicants, the likelihood of being hired for a job increases as their work experience increases. However, for male applicants, the likelihood of being hired decreases as their work experience increases, meaning the relationship between likelihood of being hired and work experience depends on gender. This finding would suggest __________.

Dwayne has a hypothesis that darkness makes people more aggressive. To test this, he brings people into the lab. The first 10 participants who come to the lab are put into a dark room with no lights. The next 10 participants who come to the lab are put into a fully lit room. He then measures how hard they hit a punching bag. What is the problem with his experiment?

How does random assignment work in a repeated measures design?

Regression to the mean is problematic in which of the following situations?