Exam 14: Two-Way Between-Groups Anova

The owners of the Syfy channel are interested in whether watching the Syfy channel causes people to become "geeky," and if so, whether any such effects depend on a person's gender.They hire a researcher to design and carry out the appropriate study.The researcher randomly assigns an equal number of men and women to watch 0, 3, 5, or 9 hours of the Syfy channel each week for 6 weeks.What is the research hypothesis for the interaction effect?

A marginal mean in a two-way ANOVA is the mean of the dependent variable:

The variations on ANOVA, ANCOVA and MANCOVA, both include a covariate in the design.

A researcher reports the results of an interaction in a two-way between-groups ANOVA as: F (1, 80) = 2.83.What decision should be made based on the value of this test statistic?

The owners of the Syfy channel are interested in whether watching the Syfy channel causes people to become "geeky," and if so, whether any such effects depend on a person's gender.They hire a researcher to design and carry out the appropriate study.The researcher randomly assigns an equal number of men and women to watch 0, 3, 5, or 9 hours of the Syfy channel each week for 6 weeks.What is(are) the main effect(s) being tested in the study?

Which of these is NOT an assumption of a two-way between-groups ANOVA?

A researcher performs a 2 × 3 ANOVA with five participants in each cell of the study design.How many cells are in this design?

A researcher wants to statistically test whether gender affects math test scores.Which test should the researcher use?

A two-way between-groups ANOVA has just two hypotheses.

A significant main effect found in a two-way between-groups ANOVA trumps any significant interaction.

The correct formula for calculating the sum of squares for within-groups variability is:

In a two-way between-groups ANOVA, there are four sources of variability.

Analysis of variance is a statistical tool that can be applied to within-groups designs.

A cell depicts one unique combination of _____ of the independent variable in a two-way ANOVA.

In a two-way factorial ANOVA, between-groups variance is divided into:

For a two-way ANOVA, _____ is the measure of effect size.

A researcher for Major League Baseball is interested in visual accuracy of the players.The indicators of visual accuracy are batting average (high vs.low) and a computer "flicker" program that indicates changes in either the central or the noncentral region of a scene.The dependent variable is the time it takes to notice a change during flickers.When the researcher looks at a table of means, the data show that central flicker and high batting average = 40; noncentral flicker and high batting average = 20; central flicker and low batting average = 20; and noncentral flicker and low batting average = 40.Assuming a very powerful statistical test, the researcher should find:

The owners of the Syfy channel are interested in whether watching the Syfy channel causes people to become "geeky," and if so, whether any such effects depend on a person's gender.They hire a researcher to design and carry out the appropriate study.The researcher randomly assigns an equal number of men and women to watch 0, 3, 5, or 9 hours of the Syfy channel each week for 6 weeks.What is the null hypothesis for the main effect of hours watched?

A researcher is examining the relation between patrol location (more affluent vs.less affluent neighborhoods) and amount of training (5 weeks, 10 weeks, or 15 weeks) to police job performance in a large city.The researcher finds that the officers trained less performed significantly better in the upper-class neighborhood, whereas the officers trained more performed significantly better in the lower-class neighborhood.What type of effect is this?

A researcher investigates the impact of color and lighting on mood at work.He manipulates the paint used in offices, including the presentation of four different colors.He also manipulates lighting by using three different lighting conditions.The null hypothesis for the interaction in this study would be: