Homework #15

Please provide your complete work and answers to the following:

1) A researcher measures attractiveness ratings of a male confederate among 30 women who were told the confederate was either single, dating, or married (n = 10 per group). What are the degrees of freedom for error for the one-way between-subjects ANOVA?

2) Without changing the value of the between-groups variance, the ________ the error variability, the more likely we are to retain the null hypothesis. Provide your answer and an explanation.

3) 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?

4) A researcher divides participants into groups that will engage in 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? (explain, not just answer) A) a related samples t-test B) a two-independent sample t-test C) a one-way between-subjects ANOVA D) both B and C

5) The following data are for three groups of subjects who are exposed to three methods of reinforcement. For the data please: A) conduct an ANOVA and state the results B) calculate eta-squared C) conduct a Tukey post-hoc D) conduct a Sheffe post-hoc