Exam 8: Experimental Design II: Factorial Designs

ATI designs look for

Sometimes, in a study with both a main effect (or two) and an interaction, the interaction is the only important finding. Explain, using the caffeine study to illustrate.

The next questions refer to the following experiment: A researcher simultaneously investigated learning style and teaching style. Students were identified as either visual/concrete learners or verbal/abstract learners, on the basis of a learning style survey. For each type of student, half were taught a statistics lesson using a computer program that included a lot of graphics, while the other half used a computer program with fewer graphics and more verbal material. After working through the program, all students were given a test on statistics. -With 25 students tested per cell of this design, how many students will be needed in all?

In a factorial study, a main effect

Use the research example on studying in noisy versus quiet environments to illustrate the concept of an interaction in a factorial design.

In a 2 (gender) x 2 (type of therapy) factorial design, males were helped by therapy A, but females were helped by therapy B. This describes

In a memory study using a 2x2 factorial, one of the factors is the presentation rate of the words, the two levels being 2 and 4 seconds per item. The researcher finds that recall is 98% accurate at 2 seconds per item and 99% accurate at 4 seconds per item (not a statistically significant difference). The most reasonable conclusion is that

In the study by Grant et al., subjects studied text materials either in a noisy or a quiet environment and also recalled the material either in a noisy or a quiet environment. What was true about this study?

Examining row and/or column means enables the researcher to determine if any _________ exist in a factorial study.

In a factorial study, what is a main effect?

What is a ceiling effect and how can one's presence cloud the interpretation of a research outcome in a factorial design?

A mixed factorial design has

A ceiling effect is said to occur when

One of the chapter's research examples concerned the so-called closing time effect. The researchers found that the gender of the rater made a difference and the time of the ratings also made a difference. That is, the study produced

In a 2x2 design, the following results occur: Which of the following is true?

Suppose you had to train someone to be an ethical and competent experimenter. What would you emphasize?

Using just two participants, Jenkins and Dallenbach studied retroactive inference in a famous study. What were there two independent variables, how would you describe their design, and what happened in the study?

The next questions refer to the following experiment: A researcher simultaneously investigated learning style and teaching style. Students were identified as either visual/concrete learners or verbal/abstract learners, on the basis of a learning style survey. For each type of student, half were taught a statistics lesson using a computer program that included a lot of graphics, while the other half used a computer program with fewer graphics and more verbal material. After working through the program, all students were given a test on statistics. -Which of the following is true about the study?

The next questions refer to the following experiment: A researcher investigated the effect of a child's attractiveness and gender on judgments of personality and intelligence. Male teachers were shown photos of children to obtain their "first impressions" of children. Each teacher was shown four photos (the order was randomized for each teacher): an attractive boy, an unattractive boy, an attractive girl, and an unattractive girl. The teachers rated the apparent friendliness of the child and also estimated the child's intelligence. -This study includes the gender of of the children in the photos as

The next questions refer to the following experiment: A researcher investigated the effect of a child's attractiveness and gender on judgments of personality and intelligence. Male teachers were shown photos of children to obtain their "first impressions" of children. Each teacher was shown four photos (the order was randomized for each teacher): an attractive boy, an unattractive boy, an attractive girl, and an unattractive girl. The teachers rated the apparent friendliness of the child and also estimated the child's intelligence. -With 30 teachers tested per cell of this design, how many teachers participated in the experiment?