Test 11
Computing a one-way between-subjects ANOVA is appropriate when ______.
there is one factor with three or more levels and different participants observed in each level
A researcher compares differences in positivity between participants in a low-, middle-, or upper middle-class family. If she observes 15 participants in each group, then what are the degrees of freedom for the one-way between-subjects ANOVA?
(2, 42)
A researcher assigns 21 adolescents to rate the likability of a person described in a vignette as having one of three personality traits. An equal number of participants are assigned to each group. Based on the results, F(2, 20) = 4.08, p<.05, what was the decision for a one-way between-subjects ANOVA?
Reject the null hypothesis
To summarize a one-way within-subjects ANOVA, we report each of the following except, ______.
The critical value
Without changing the value of error variance, the ______ the between-groups variability, the more likely we are to reject the null hypothesis.
larger
The source of variability associated with error variance in the one-way between-subjects ANOVA is called ______.
within-groups variability
-A researcher divides participants into groups that will engage in either low, moderate, or intense levels of exercise. The total calories consumed by participants following the exercise are then recorded. What type of statistical design is appropriate for this study?
-a one-way between-subjects ANOVA
The following is a summary of a one-way between-subjects ANOVA: F(2, 37) = 3.42, p < .05, = .12. How many pairwise comparisons need to be made for this ANOVA result?
3
A researcher computes a one-way within-subjects ANOVA in which k = 3 and n = 10. What is the critical value for this test at a .05 level of significance?
3.55
A researcher computes a one-way within-subjects ANOVA for a study in which fifteen participants are observed across five groups. If the degrees of freedom total is 59, then how many observations (data points) were recorded in this study?
60
A researcher conducts two studies on child health. In Study 1, 30 children consume either a low-, moderate-, or high-fat meal (n = 10 per group). In Study 2, the researcher conducts the same study, except that a No Meal control group is added, with n = 10 in each group. If = 3.11 in both studies, then in which study will the decision be to reject the null hypothesis at a .05 level of significance for a one-way between-subjects ANOVA?
Study 2
Homogeneity of variance is an assumption for the one-way between-subjects ANOVA. What does this assumption mean?
that the variance is equal in each population from which samples are selected
A researcher assigned participants (n = 8 per group) to read vignettes describing a person engaging in either a helpful, hurtful, or neutral act. Different participants were assigned to each group and asked to rate how positively they viewed the person described in the vignette. What is the critical value for the one-way between-subjects ANOVA at a .05 level of significance?
3.47
The following is a summary of a one-way between-subjects ANOVA: F(2, 37) = 3.42, p < .05, = .12. How many participants were observed in this study?
40
The term "between-subjects" refers to ______.
having different participants in each group and each participant is tested only once
Post hoc tests are computed ______.
Following a significant ANOVA test to make pairwise comparisons.
ANOVA stands for ______.
analysis of variance
A researcher notes that the variability attributed to difference between group means is quite large. Which source of variation is the researcher referring to?
between-groups
Following a significant one-way between-subjects ANOVA in which k = 4, what is the next appropriate step?
conduct a Tukey HSD post hoc test
A professor compared differences in class grades between students in their freshman, sophomore, junior, and senior years of college. If different participants were in each group, then what type of statistical design is appropriate for this study?
a one-way between-subjects ANOVA
The term "within-subjects" refers to ______.
observing the same participants in each group
For an analysis of variance, the term "one-way" refers to ______.
the number of factors in a design
A lowercase k is used to denote ______ using a one-way ANOVA.
the number of groups in a study
According to lecture which measure of effect size will we be using for both types of one-way ANOVA?
Eta Squared
A sex therapist has adult female clients rate their level of interest in each of six relationship situations. To analyze differences in the ratings, what type of statistical design is appropriate for this study?
a one-way within-subjects ANOVA
