# GC PSY520 Full Course – Discussions and Assignments – January 2017

**GC PSY 520 Week 1 Discussion 1 & 2**

dq 1

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.

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.

**GC PSY 520 Week 2 Discussion 1 & 2**

dq 1

The process of random sampling guarantees that the sample

selected will be representative of the population. Is this statement true?

Discuss.

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.

**GC PSY 520 Week 3 Discussion 1 & 2**

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.

dq 2

Discuss the strengths and weaknesses of correlational and

regression studies; discuss concepts such as positive and negative

correlations, correlation coefficients, confounding, and causality.

**GC PSY 520 Week 4 Discussion 1 & 2**

dq 1

Explain why there is an inverse relationship between

committing a Type I error and committing a Type II error. What is the best way

to reduce both kinds of error?

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.

**GC PSY 520 Week 5 Discussion 1 & 2**

dq 1

Explain why using the t statistic may be an appropriate

alternative to using a z-score (use the concept of estimated standard error to

justify your answer).

dq 2

Discuss how the t-test for correlated groups and the t-test

for single samples are alike and different.

**GC PSY 520 Week 6 Discussion 1 & 2**

dq 1

Review the four “ANOVA” videos in the Calculations

section of the “Statistics Visual Learner” media piece.

Explain the major differences between analyzing a one-way

ANOVA versus a two-factor ANOVA, and explain why factorial designs with two or

more independent variables (or factors) can become very difficult to interpret.

dq 2

Explain how the ANOVA technique avoids the problem of the

inflated probability of making Type I error that would arise using the

alternative method of comparing groups two at a time using the t-test for

independent groups.

**GC PSY 520 Week 7 Discussion 1 & 2**

dq 1

Review the three “Non-parametric” test videos in

the Calculations section of the “Statistics Visual Learner” media

piece.

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?

Test at the .05 level of significance.

Ice Cream Flavor | |||

A | B | C | D |

12 | 18 | 28 | 22 |

dq 2

Is it true that parametric tests are generally more powerful

than nonparametric tests? If so, give two reasons why you might choose to use a

nonparametric test instead of a parametric test.

**GC PSY 520 Week 8 Discussion 1 & 2**

dq 1

To determine whether a new sleeping pill has an effect 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?

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?

**GC PSY 520 Week 2 Exercise**

**Details:**

Complete the following exercises from “Review

Questions” located at the end of each chapter and put them into a Word

document to be submitted as directed by the instructor.

- Chapter

1, numbers 1.8 and 1.9 - Chapter

2, numbers 2.14, 2.17, and 2.18 - Chapter

3, numbers 3.13, 3.14, 3.18, and 3.19 - Chapter

4, numbers 4.9, 4.14, 4.17, and 4.19

Show all relevant work; use the equation editor in Microsoft

Word when necessary.

**GC PSY 520 Week 3 Probability Project**

**Details:**

Use the document “Probability Project” to complete the

assignment.

While APA format is not required for the body of this

assignment, solid academic writing is expected, and documentation of sources

should be presented using APA formatting guidelines, which can be found in the

APA Style Guide, located in the Student Success Center.

PSY-520 Graduate Statistics

Topic 3 – Probability Project

__Directions:__Use the following information to complete

the assignment. While APA format is not required for the body of this

assignment, solid academic writing is expected, and documentation of sources

should be presented using APA formatting guidelines, which can be found in the

APA Style Guide, located in the Student Success Center.

There are many misconceptions about probability which may

include the following.

· *All events are equally likely*

· *Later events may be affected by or compensate for
earlier ones*

· *When determining probability from statistical
data, sample size is irrelevant*

· *Results of games of skill are unaffected by the
nature of the participants*

· *“Lucky/Unlucky” numbers can influence random
events*

· *In random event involving selection, results are
dependent on number rather than rations*

· *If events are random then the results of a series
of independent events are equally likely*

The following statements are all incorrect. Explain the

statements and the errors fully using the probability rules discussed in topic

two.

1. I have flipped and unbiased coin three times and got

heads, it is more likely to get tails the next time I flip it.

2. The Rovers play Mustangs. The Rovers can win, loose, or

draw, so the probability that they win is 1/3.

3. I roll two dice and ad the results. The probability of

getting a total of 6 is 1/12 because there are 12 different possibilities and 6

is one of them.

4. Mr. Purple has to have a major operation. 90% of the

people who have this operation make a complete recovery. There is a 90% chance

that Mr. Purple will make a complete recovery if he has this operation.

5. I flip two coins. The probability of getting heads and

tails is 1/3 because I can get Heads and Heads, Heads and Tails, or Tails and

Tails.

6. 13 is an unlucky number so you are less likely to win

raffles with ticket number 13 than with a different dumber.

**GC PSY 520 Week 3 Exercise**

**Details:**

Complete the following exercises located at the end of each

chapter and put them into a Word document to be submitted as directed by the

instructor.

Show all relevant work; use the equation editor in Microsoft

Word when necessary.

1. Chapter 6, numbers 6.7, 6.10, and 6.11

2. Chapter 7, numbers 7.8, 7.10, and 7.13

**GC PSY 520 Week 4 Exercise**

**Details:**

Complete the following exercises located at the end of each

chapter and put them into a Word document to be submitted as directed by the

instructor.

Show all relevant work; use the equation editor in Microsoft

Word when necessary.

1. Chapter 9, numbers 9.7, 9.8, 9.9, 9.13, and 9.14

2. Chapter 10, numbers 10.9, 10.10, 10.11, and 10.12

3. Chapter 11, numbers 11.11, 11.19, and 11.20

4. Chapter 12, numbers 12.7, 12.8, and 12.10

**GC PSY 520 Week 5 Exercise**

**Details:**

Complete the following exercises located at the end of each

chapter and put them into a Word document to be submitted as directed by the

instructor.

Show all relevant work; use the equation editor in Microsoft

Word when necessary.

1. Chapter 13, numbers 13.6, 13.8, 13.9, and 13.10

2. Chapter 14, numbers 14.11, 14.12, and 14.14

3. Chapter 15, numbers 15.7, 15.8, 15.10 and 15.14

**GC PSY 520 Week 5 Correlation and Regression**

**Details:**

Use the attached document “Correlation and Regression” to

complete the assignment.

While APA format is not required for the body of this

assignment, solid academic writing is expected, and documentation of sources

should be presented using APA formatting guidelines, which can be found in the

APA Style Guide, located in the Student Success Center.

*This benchmark assignment assesses the following
programmatic competencies: 3.1 Interpret psychological phenomena using
scientific reasoning.*

PSY-520 Graduate Statistics

Topic 5– Benchmark – Correlation and Regression Project

__Directions:__Use the following information to complete

the questions below. While APA format is not required for the body of this

assignment, solid academic writing is expected, and documentation of sources

should be presented using APA formatting guidelines, which can be found in the

APA Style Guide, located in the Student Success Center.

1. Select at least three variables that you believe have a

linear relationship.

a. Specify which variable is dependent and which are

independent.

2. Collect the data for these variables and describe your

data collection technique and why it was appropriate as well as why the sample

size was best.

a. Submit the data collected by submitting the SPSS data

file with your submission.

3. Find the Correlation coefficient for each of the possible

pairings of dependent and independent variables and describe the relationship

in terms of strength and direction.

4. Find a linear model of the relationship between the three

(or more) variables of interest.

5. Explain the validity of the model.

**GC PSY 520 Week 6 Exercise**

**Details:**

chapter and put them into a Word document to be submitted as directed by the

instructor.

Show all relevant work; use the equation editor in Microsoft

Word when necessary.

1. Chapter 16, numbers 16.9, 16.10, 16.12 and 16.14

2. Chapter 17, numbers 17.6, 17.7, and 17.8

3. Chapter 18, numbers 18.8, 18.11, and 18.12

**GC PSY 520 Week 7 Exercise**

**Details:**

chapter and put them into a Word document to be submitted as directed by the

instructor.

Show all relevant work; use the equation editor in Microsoft

Word when necessary.

1. Chapter 19, numbers 19.9, 19.10, 19.13, 19.14, and 19.16

2. Chapter 20, numbers 20.5, 20.6, 20.7, and 20.10

**PSY 520 week 7 MANOVA Project**

PSY-520 Graduate Statistics

Topic 7 – MANOVA Project

Directions: Use the following information to complete the assignment.

While APA format is not required for the body of this assignment,

solid academic writing is expected, and documentation of sources

should be presented using APA formatting guidelines, which can be

found in the APA Style Guide, located in the Student Success Center.

A researcher randomly assigns 33 subjects to one of three groups.

Group 1 receives technical dietary information interactively from an

on-line website. Group 2 receives the same information from a nurse

practitioner, while Group 3 receives the information from a video tape

made by the same nurse practitioner.

The researcher looked at three different ratings of the presentation;

difficulty, usefulness, and importance to determine if there is a

difference in the modes of presentation. In particular, the researcher

is interested in whether the interactive website is superior because

that is the most cost-effective way of delivering the information.

Group

Usefulness

Difficulty

Importance

1

20

5

18

1

25

9

8

1

23

15

20

1

16

9

22

1

20

6

22

1

28

14

8

1

20

6

13

1

25

8

13

1

24

10

24

1

18

10

20

1

17

9

4

2

28

7

14

2

25

14

5

2

26

9

20

2

19

15

22

2

29

14

12

2

15

6

2

2

29

10

5

2

26

11

1

2

22

5

2

2

15

15

14

2

29

6

4

2

15

6

3

3

22

8

12

3

27

9

14

3

21

10

7

3

17

9

1

3

16

7

12

3

19

9

7

3

23

10

1

3

27

9

5

3

23

9

6

3

16

14

22

1. Run the appropriate analysis of the data and interpret the results.

2. How could this study have been done differently? Why or why not

would this approach be better?

**PSY 520 week 8 Research Question Project**

**Details:**

In 1,250-1,500 words, answer the following questions about

possible research options.

- Create

a research question in the field of psychology that you are interested in

researching. Write questions clearly. Include a brief background of the

problem you are proposing and why it is important to the field of

psychology. - State

the null and alternative hypothesis (in both words and statistical

notation) need to address the research question. - Choose

which statistical test would be used to conduct the study and support it

with research. - Describe

the type of data needs to be collected to conduct the study and what

techniques are best for collecting data.

Use three to five scholarly resources to support your

explanations.

Prepare this assignment according to the guidelines found in

the APA Style Guide, located in the Student Success Center. An abstract is not

required.

This assignment uses a rubric. Please review the rubric

prior to beginning the assignment to become familiar with the expectations for

successful completion.

You are required to submit this assignment to Turnitin.

Please refer to the directions in the Student Success Center.

**GC PSY 520 Week 8 Exercise**

**Details:**

chapter and put them into a Word document to be submitted as directed by the

instructor.

Show all relevant work; use the equation editor in Microsoft

Word when necessary.

1. Chapter 21, numbers 21.4, 21.7, 21.8, 21