GCU PSY380 Exam 3

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)

If the coefficient of determination is 0.12 and SSY = 225, then what is the sum of squares regression for an analysis of regression?

27

A researcher computes the following one-way within-subjects ANOVA table for a study in which k = 3 and n = 12. State the decision at a 0.05 level of significance. Source of Variation SS df MS Fobt Between groups 450 Between persons 20 Within groups (error) Total 1030

Reject the null hypothesis

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. If Fobt = 4.08 for this study, then what was the decision at a 0.05 level of significance for a one-way between-subjects ANOVA?

Reject the null hypothesis.

The term "between-subjects" refers to

observing different participants one time in each group

In a study with three groups and 13 participants in each group, the sum of squares for the within-groups source of variation is 18. What is the value for the mean square within-groups in this study?

0.5

A researcher computes a one-way within-subjects ANOVA in which k = 4 and n = 20. What are the degrees of freedom error for this test?

The answer is NOT 79. I think it is 57.

The coefficient of determination is mathematically equivalent to

eta-squared

A researcher asks participants to taste each of three meals and to choose the one they like best. The same foods are in each meal, however the calorie total of each meal is different. One is low in calories, one is moderate in calories and one is high in calories. Based on the observed frequencies given below, what is an appropriate conclusion for this test at a .05 level of significance? Type of Meal Low Calorie Moderate Calorie High Calorie fo 6 7 17 fe 10 10 10

Participants liked the high calorie meal more than was expected.

Which of the following is used to determine the significance of predictions made by a best fitting linear equation?

analysis of regression

The degrees of freedom for a chi-square goodness-of-fit test are

k − 1

The correlation coefficient ranges from −1.0 to +1.0, with values closer to ±1.0 indicating

a stronger relationship between two factors

Using an A × B ANOVA, a researcher concludes that Factor A is significant, independent of Factor B. In this study, this researcher found a significant

main effect of Factor A

Following a significant one-way between-subjects ANOVA in which k > 2, what is the next appropriate step?

Conduct post hoc tests.

A researcher conducts a 2 × 4 between-subjects ANOVA in which 12 participants were observed in each group. If SSB = 18 and SSE = 264 for this study, then what is the decision for Factor B at a 0.05 level of significance?

Retain the null hypothesis.

A researcher randomly assigned 32 children to observe a short clip depicting either their favorite superhero, a parent, a teacher, or no person at all (n = 8 per group). If SSBG = 30 and SSE = 104, then what was the decision at a 0.05 level of significance for a one-way between-subjects ANOVA?

Retain the null hypothesis.

If SSXY = −16.32 and SSX = 40.00 for a set of data points, then what is the value of the slope for the best-fitting linear equation?

−0.41