PSYC 515
SPSS HOMEWORK 8 INSTRUCTIONS: PUTTING IT ALL TOGETHER (40 POINTS)
Juliana Paige Koreenczuk Jones
Please note that for all problems in this course, the standard cut-off (alpha) for a test of significance will
be .05, and you always report the exact power unless SPSS output states p=.000 (you’d report p<.001).
Also, remember that we divide the p-value in half when reporting one-tailed tests with 1 – 2 groups.
1) List the three decisions an editor can make
concerning a manuscript according to Section 12 in
the APA Manual.
Accept, invite revisions, reject
2) When you submit a manuscript involving human
research in the United States, how might you verify
that you have complied with ethical standards
(according to Section 12 in the APA Manual)?
You have to submit a certificate of compliance
with APA Ethical Principles Form
3) According to the “Final Considerations” presentation,
several meta-analyses reveal that many published
research studies in our field suffer from low
statistical power, primarily due to what?
Inadequate sample sizes
4) According to the “Final Considerations” presentation,
what term is the “probability of correctly rejecting
the null hypothesis”, and is typically set at 0.8?
Power
5) According to the “Final Considerations” presentation,
it is important to include an effect size so that we can
assess whattype of significance (that that reveals if it
is meaningful rather than just statistically
significant)?
Size of association or difference
None for this week.
6) List one strength of a nonparametric test. (3 pts)
Nonparametric tests can be used
without making assumptions about
the distrabution
7) If your goal is to not only explore a relationship between two
variables but also predict one given the value of the other, which
type of statistical test is most appropriate? (3 pts)
Simple regression
8) What statistical test is most appropriate if you want to examine
Kruskal-Wallis Test
P 1 – CONCEPTS this ’s r and pr (3 = 15 pts)
P 2 – SPSS APPLICATION ’s readings presentations
P 3 – CUMULATIVE include theoretical, -calculations, and use SPSS any
cover thus f . (12+13 = 25 )
PSYC 515
Problem Set 1: (13 pts)
A teacher wanted to see if social anxiety affects performance on an oral assignment. To examine
this, students completed social anxiety scales and were classified into “Low,” “Average,” and “High”
levels of social anxiety. The data presented in the table below are the oral presentation grades (in
percentages) earned by the 45 students separated by their social anxiety classification. Conduct
the most appropriate statistical analysis to determine whether grades on the oral assignment
differed based on level of social anxiety. (Hint: see week 1 presentations)
whether there is a difference in graduation rates (percentages)
between home schooling, public schools, and private schools in
your state of residence? Assume the data does NOT meet the
assumptions for a parametric test. (3 pts)
9) What statistical test would be most appropriate if you were
interested in seeing how religiosity changes in early adulthood?
Religiosity was measured using an interval scale, and the same
participants provided data at two time points – at age 18 and 28.
Assume the data meets all assumptions for a parametric test. (3 pts)
One-way repeated ANOVA
Oral presentation grade (%)
Low
social anxiety
Average
social anxiety
High
social anxiety
72
80
77
68
85
71
73
73
73
75
81
69
97
73
90
73
91
74
95
73
76
88
73
67
89
71
81
97
75
75
88
78
68
89
90
79
93
89
58
89
88
83
79
75
81
10) Paste appropriate SPSS output. (3 pts)
PSYC 515
11) Paste appropriate SPSS graph, formatted in APA (2 pts). Write an appropriate figure number and title using
APA conventions (e.g., alignment, spacing, font size, use of bold / italics). (4 pts)
Figure 1
Bar Graoh Representing Level of Anxiety on Mean Scores of an Oral Assignment
PSYC 515
12) Write an APA-style Results section based on your analysis. All homework “Results sections” should follow
the examples provided in the presentations and textbooks for that particular statistical test. Don’t forget to
include a decision about the null hypothesis. Include a callout to Figure 1. (4 pts).
We ran a One-way ANOVA to see if there was a difference between leavel of anxiety on performance of an
oral assignment. We found that the Levenes test was non-significant (p= .109). Our ANOVA was significant
and we rejected our null hypotheses F(2,42)= 4.845, p=.013. We calculated an effect size of 0.187
13) Identify a potential confounding variable with the study as it was presented (you can use your imagination!).
Justify why you think it may be a confounding rather than an extraneous variable. (2 pts)
Level of anxiety could be a confound variable. It is har to truly understand ones level of anxiety other than the
self report. Extraneoud variables can be accounted for, while confounds are things that are harder to account for
or be measured.
DONE! S 11:59 . . (ET) FRIDAY M /Week 8.
