PSY 520 All Discussion Question Week 1 to 8 with Responses
PSY 520 Topic 1 DQ 1
Statistics can be a
foreign topic to many people and/or cause anxiety. This checklist may help you
succeed.
Schedule 20-25 hours
a week for studying and completing assignments Review the specific terms for
each topic on the Statistics Visual Learner website Read the assigned chapters
from the textbook and complete the Progress Checks as you are reading for
practice
Use the Electronic
Resources for extra assistance (Khan videos, SPSS tutorials, SAGE resources,
etc.)
Complete the
assignment(s) for each topic Having reviewed this checklist, what challenges
might you face? What steps can you take to succeed in the class? Review the
levels of measurement terms in the Statistics Visual Learner media piece.
Compare and contrast Stevens's four scales of measurement and explain when each
type of scale should be used.
PSY 520 Topic 1 DQ 2
The professor teaching a large
introductory class gives a final exam that has alternate forms, A, B, and C. A
student taking the exam using Form B is upset because she claims that Form B is
much harder than Forms A and C. Discuss how percentile point data might be
useful to determine if the student is correct.
PSY 520 Topic 2 DQ 1
The process of random sampling
guarantees that the sample selected will be representative of the population.
Why is this statement not true? What other factors and variables influence the
outcomes of studies?
PSY
520 Topic 2 DQ 2
Review the video on Normal
Distribution in the Calculations section of the "Statistics Visual
Learner" media piece.Bob compares his SAT Verbal score of 400 to Marge's
ACT Verbal score of 20. "I beat you," he exclaims. "My score is
20 times your score!" Although his multiplication is good, his logic is
faulty. Explain why.
PSY
520 Topic 3 DQ 1
Review the video "Linear Correlation" in the Calculations section of the "Statistics Visual Learner" media piece.It is sometimes said that the higher the correlation between two variables, the more likely the relationship is causal. Do you think this is correct? Discuss.
PSY 520 Topic 3 DQ 2
Discuss the strengths and
weaknesses of correlational and regression studies; discuss concepts such as
positive and negative correlations, correlation coefficients, confounding
variables, and causality.
PSY
520 Topic 4 DQ 1
Explain the Type I error and give an
example. Explain Type II error and give an example. What is the best way to reduce
both kinds of error? Find a current scenario that has a Type I error and a Type
II error. Is this scenario an example of an inverse relationship? Why or Why
not?
PSY
520 Topic 4 DQ 2
Review the term Significance Test
in the "Statistics Visual Learner" media piece. When a newspaper or magazine
article reports the results of a study and draws a conclusion without also
reporting whether the results are statistically significant, what are the
possible reasons for doing so? How seriously should you take the conclusion
offered in such a study? Discuss.
PSY
520 Topic 5 DQ 1
What
are the strengths and weaknesses of using a t-test? Give a real-world
example to support your answer.
PSY 520 Topic 5 DQ 2
Discuss how the t-test for
correlated groups and the t-test for single samples are alike and
different. Give a current example to support your answer.
PSY
520 Topic 6 DQ 1
Review the four "ANOVA"
videos in the Calculations section of the "Statistics Visual Learner"
media piece.
Explain why factorial designs
with two or more independent variables (or factors) can induce errors when interpreting
data. Give an example.
PSY 520 Topic 6 DQ 2
Explain how the ANOVA impacts a
Type I error. How might a Type I error change when comparing groups two at a
time using the t-test for independent groups?
PSY
520 Topic 7 DQ 1
Review the three
"Non Parametric" test videos in the Calculations section of the
"Statistics Visual Learner" media piece.
How would you create
a statistical analysis based on the scenario below? Explain. What level of
significance would you test at and why?
A researcher is
examining preferences among four new flavors of ice cream. A sample of n =
80 people is obtained. Each person tastes all four flavors and then picks a
favorite. The distribution of preferences is as follows. Do these data indicate
any significance preferences among the four flavors using the chi-square test?
PSY 520 Topic 7 DQ 2
Describe the differences between
parametric and nonparametric tests. Which are more powerful and why? Give an
example of a situation where you would select a parametric and a nonparametric
test.
PSY 520 Topic 8 DQ 1
To determine whether a new
sleeping pill has an affect that varies with dosage, a researcher randomly
assigns adult insomniacs, in equal numbers, to receive either 4 or 8 grams of
the sleeping pill. The amount of sleeping time is measured for each subject
during an 8-hour period after the administration of the dosage. What type of
design is this, and what type of statistic is needed to analyze the data
(consider ABAB studies)?
PSY 520 Topic 8 DQ 2
Dr. Bill Board designs a 2 X 2
between-subjects factorial design, where Factor A is word frequency (low or
high) and Factor B is category cues (no cues or cues). Assume that the data are
interval. What type of statistic is needed to analyze the data?
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