Review the SPSS output file which reports the results of the
between-group (independent group) one-way ANOVA to see if the mean
alcohol by volume (%) of the beer differs as a function of quality of
the brand as rated by a beer expert (in 2012). Answer the following
questions based on your observations of the SPSS output file:
Looking at the descriptives (first information), do you see
differences in the mean alcohol contents for the three levels of
Looking at the Test for Homogeneity of Variances (Levene Statistic),
is it reasonable to proceed with the ANOVA? Is the assumption met, or
violated? How do you know?
Looking at the results of the ANOVA, is there a significant
difference in the mean alcohol content for beers in the three quality
groups? How do you know? Write the results in the following format: F(df value) = ___, p value = ______.
The pairwise post hoc tests indicate which quality groups' means are
statistically significantly different for the others. Using the results
of the Tukey HSD post hoc test, what two quality rating groups had
significantly different mean alcohol by volume levels? How do you know?
Use the following information to ensure successful completion of the assignment:
Researchers wanted to explore self-esteem in adolescent boys and
adolescent girls. Each respondent completed a 10-item self-esteem scale
(they chose one rating for each item from a Likert-type scale, 1 = strongly disagree and 5 = strongly agree). The sum of the 10 ratings was each respondent’s self-esteem score. Their results were: t = 2.01, d = .90 (40 girls, 40 boys).
Instructors will be using a grading rubric to grade the assignments.
It is recommended that learners review the rubric prior to beginning
the assignment in order to become familiar with the assignment criteria
and expectations for successful completion of the assignment.
Doctoral learners are required to use APA style for their writing
assignments. The APA Style Guide is located in the Student Success
This assignment requires that at least two additional scholarly
research sources related to this topic, and at least one in-text
citation from each source be included.
In an essay of 250-500 words plus reference, use the scenario presented in part 1a, above, to thoroughly answer the following questions:
What statistical test did the researchers use to determine if there
was a statistically significant difference in levels of self-esteem
between the boys and the girls?
What was the purpose of calculating a Cohen's d? When is a Cohen's d calculated? Interpret d=.90. What does it mean in this example?
What if the researcher compared the adolescent boys before treatment
and again after treating them for depression? What type of t-test would
be most appropriate in this case, and why?