HTH 320 Final

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 reports the following equation for a best-fitting straight line to a set of data points: Y=−1.01X+3.24 Which value is the y-intercept?

3.24

the degrees of freedom for a chi-square test for independence test are

(k1-1) (k2-1)

The correlation coefficient ranges between ____ and ____.

-1; +1

A researcher measures the relationship between narcissism and willingness to help. If SSxy= 240, SSx= 320, and SSy = 410, then what is the value of the correlation coefficient?

0.66

The method of least squares is used to determine the ________ straight line to a set of data points.

best fitting

Which of the following is recorded using a chi-square goodness-of-fit test and a chi-square test for independence?

both variance and frequency expected

Which of the following is a reason why it can be necessary to include two factors in the same statistical design?

your hypothesis may require that you observe two factors

A researcher reports the following regression equation for two variables, X and Y: Y=5.10X -1.50 If X = 2.30, then what is the value of Y?

10.23

A researcher measures anxiety levels among participants in the presence and absence of a fearful stimulus. If the same participants are observed in each group, then what type of statistical design is appropriate for this study?

both a related samples t-test and a one-way between-subjects ANOVA

Which of the following statements is the appropriate way to read the degrees of freedom for an ANOVA with 10 participants in each of four groups?

3 and 36 degrees of freedom

A researcher groups college students in a study based on their year in college (freshman, sophomore, junior, senior) and the type of college they attend (junior, technical, university). He concludes that perceptions of academic cheating are more positive among freshman attending junior college. To reach this conclusion, which statistical test would need to be computed?

a two-way between-subjects ANOVA; a simple main effect test; and a post hoc test

A chi-square goodness-of-fit test leads to a decision to retain the null hypothesis. Which of the following correctly explains this decision?

Frequencies observed were statistically similar to the frequencies expected at each level of the categorical variable

A researcher randomly measures social adjustment among children from different family backgrounds (levels of Factor A: divorced, married, single) who engaged in one of five social activities (Factor B). For this study, 10 children were observed in each group. If SSA= 10, MSB= 12, SSAB = 48, and SSE= 405, then which effect was significant at a .05 level using the two-way between-subjects ANOVA?

Factor B (social activities)

If a two-sample data do not meet the normality or the homogeneity of variance, what type of tests you can use?

Levene test

If a two-sample data do not meet the normality or the homogeneity of variance, what type of tests you can use?

Mann-Whitney test

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 .05 level of significance for a one-way between-subjects ANOVA?

Retain the null hypothesis.

An unanticipated variable not accounted for in a research study that could be causing or associated with observed changes in one or more measured variables is called

a confound variable

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

Which of the following indicates the strongest correlation?

r = -0.90

For an analysis of variance, the term "one-way" refers to

the number of factors in the design

A researcher computes a two-way between-subjects ANOVA and finds a significant A * B interaction and two main effects. Which significant effect should be analyzed first?

the significant interaction

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

If b = -0.57, MY= 2.75, and MX = 5.25 for a set of data points, then what is the value of the y-intercept for the best-fitting linear equation?

5.74

Based on the skewness you calculated, is this variable normally distributed?

The skewness value out of ±2.58, the data is not normally distributed.