Ch. 2
A _____________ is a summary display for a distribution of data organized or summarized in terms of how often (or frequently) scores occur.
Ch. 3
A scientist records the following sample of scores (n = 6): 3, 6, 4, 1, 10, and 12. What is the sample mean of these scores?
Ch. 4
A researcher measures the following scores: 12, 14, 16, 18, and 20. Compute the SS for these data.
Ch. 8
State the four steps of hypothesis testing.
The decision in hypothesis testing is to retain or reject which hypothesis: null or alternative?
Ch. 9
Assuming α = .05, what is the critical value in each of the following t distributions?
df = 10, two-tailed test
df = 30, one-tailed test (lower tail critical)
df = ∞, two-tailed test
df = 15, one-tailed test (upper tail critical)
A researcher reports that a sample of workers with high-stress careers slept significantly less than workers in the general population, t(48) = 2.36, p < .05. Compute eta-squared for this one-sample t test.
Ch. 10
A researcher records the amount of computer use (in hours per day) in a sample of students and then matches the students based on their amount of computer use. Is this an example of matching through experimental manipulation or matching through natural occurrence?
Ch. 12
State the four assumptions for the one-way between-subjects ANOVA.
Make a decision given the following values for the F statistic in a test with 3 and 20 degrees of freedom.
Fobt = 3.05
Fobt = 4.00
Fobt = 5.35
Social comparisons and prosocial behavior. To check that a manipulation of social comparison made in the study was effective, Yip and Kelly (2013) computed a one-way ANOVA and reported the following result for one such check: F(2, 120) = 6.42. Following on the information given, answer the following questions.
How many groups were compared in this test?
How many participants were observed in this study?
Was the outcome of this test significant at a .05 level of significance?
Ch. 13
How are participants observed using the within-subjects design?
State the three sources of variation in the one-way within-subjects ANOVA.
Ch. 14
If the value of mean square error increases, will the value of the test statistic increase or decrease?
Rodent species and sociality. Freitas, El-Hani, and da Rocha (2008) tested the hypothesis that rodent species (four different species) and sex (male, female) influence the level of affiliation acquired through social behavior. They measured the number of social behaviors exhibited by each rodent during a social encounter. As part of their study, they reported the following:
Hypothesis test was performed by means of a [factorial] two-way ANOVA. The test was able to detect significant differences only among species, not among sexes. (Freitas et al., 2008, p. 389)
Is a significant main effect or interaction evident in this study and, if so, for which factor?
What is the appropriate next step?
Ch. 15
A researcher reports a significant positive correlation and concludes that spending more time writing a research paper will cause a better grade on the paper. Is this conclusion appropriate? Explain.
How can an outlier alter the relationship between two factors?
Ch. 16
What is a key advantage of using multiple regression?

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