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Conceptual
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Explain findings
100
A psychologist would like to examine the effects of gardening on the relaxation level of retirees. One group does not work in the garden, one group works in the garden once a week, and the third group works in the garden once a day. The psychologist records the relaxation level for each retiree (scale from 1-20).
What is a One-Way ANOVA?
100
The degrees of freedom for a Pearson's Correlation test with a sample of N=45.
What is df = 43?
100
What statistic tells you the percentage of the DV that can be explained by the group of predictors in a regression?
What is the R-squared?
100
If you conduct a study where people are randomly assigned to an experiment condition (control vs. placebo vs. treatment) and randomly assigned to a time of day (morning vs. evening), how many conditions would this study have overall?
What is 3 x 2 ANOVA = 6 conditions?
100
When you are examining the output on a two-way factorial ANOVA, you want to see if there is a Main Effect of college major on social skills. You obtain the following findings: F= 2.65, p =.067 Is there a main effect?
What is no?
200
A researcher would like to examine how the chemical tryptophan, contained in foods such as turkey, can affect mental alertness. A sample of N = 9 college students is obtained and each student’s performance on a familiar video game is measured before eating turkey, 5 minutes after eating turkey, 15 minutes after eating turkey, and 30 minutes after eating turkey.
What is repeated measures ANOVA?
200
Two interval variables have an SSx = 4, SSy = 16, and SP = -6. What is r?
What is r = -.75?
200
A college professor reports that students who take less time to finish exams tend to get better grades than students who hold on to exams until the last possible moment. The direction of this relationship is ____________.
What is negative?
200
What are the critical r-value(s) that forms the boundary of the rejection region for a test with a sample of N = 25 participants, an alpha level of .05?
What is +/- 0.396 (or 0.40)?
200
When interpreting the output for an ANOVA, the column you use to determine if an effect is signifcant?
What is Sig.?
300
A researcher is interested in understanding what leads to fights between couples. They believe that interpersonal trust might be related to how often couples to fight.
What is a correlation?
300
If you ran an ANOVA with F = 3.6, what does this tell you about the size of the treatment effect?
The treatment effect was 3.6 times larger than would have been expected if the null was true.
300
This happens to the F-critical value of an ANOVA if the number of participants is increased.
What is the F-critical value gets smaller?
300
A correlation with an r-value close to -1 indicates a ___________ relationship than a correlation with an r-value close to 0.
What is stronger?
300
When is it a good idea to make a list of all the possible comparisons you need to make before actually writing out your findings as a research report?
When conducting a Post-Hoc test (Tukey or LSD) OR when conducting a Two-Way ANOVA.
400
A psychologist examines the relationship between drinking coffee and problem-solving. Participants report if they drank coffee that day (drank coffee vs. no coffee), and then researchers record how many math problems they can solve in 15 minutes.
What is an independent samples t-test?
400
Explain precisely what you have to do to calculate the Grand Mean when doing an ANOVA?
What is add up all the scores across all conditions, and then divide by N?
400
If a researcher wants to conduct research examining the relationship between illegal drug use and violent crime, why would it be impossible for them to conduct an experiment?
Because it would be unethical (or impossible) to manipulate either of these variables in an experiment.
400
For an experiment comparing more than two treatment conditions, why should you use an ANOVA rather than separate t tests?
Since you will increase your chance of making a Type I error. Alpha will increase. Best to use as few tests as possible.
400
When conducting a One-Way ANOVA to see if location on campus (Library vs. Dormroom vs. Cafeteria) has an effect on people’s self-reported happiness (scale of 1-10). You calculate that the eta-squared (η2) = .18. Explain what this means in terms of the research question
It means that 18% of people’s self-reported happiness can be explained by their location on campus.
500
Researchers want to know if owning different pets (dog vs. cat vs. none) leads to different levels of happiness. The researcher also is interested in finding out if the relationship between pet ownership and happiness depends upon if the individual has allergies.
What is a two-way ANOVA?
500
When solving a one-way ANOVA, there is an F = 2.00, and MSwithin = 8, DFbetween = 2. What is the SSbetween?
What is 32?
500
Researchers find that there is a negative relationship between height and number of shoes owned. Explain a possible third variable that might explain this relationship.
What is gender? Or something else that makes sense :)
500
The situation in which you must use a post-hoc test in an ANOVA.
What is if the ANOVA has 3 or more conditions AND/OR if the ANOVA is significant?
500
You conduct the same correlational research study 4 times with a different sample each time. For each sample, you calculate the corrletaion. For which sample is the correlation the strongest? (a) r = -.67, p = .007; (b) r = .62, p = .002; (c) r = -.42, p = .001; (d) r = .12, p = .678.
What is (a)? - the p-value only lets you know if it is statistically significant or not, the r = tells you the strength of the relationship (or you can use it to find effect-size r-squared).