# Psych625 week 5 time to practice

psych625_r1_week_five_time_to_practice

University of Phoenix Material

Time to Practice – Week Five

Complete Parts A, B, and C below.

Part A

Some questions in Part A require that you access data from Statistics for People Who (Think They) Hate Statistics. This data is available on the student website under the Student Text Resources link.

1.Use the following data to answer Questions 1a and 1b.

Total no. of problems correct (out of a possible 20)Attitude toward test taking (out of a possible 100)

1794

1373

1259

1580

1693

1485

1666

1679

1877

1991

a.Compute the Pearson product-moment correlation coefficient by hand and show all your work.

b.Construct a scatterplot for these 10 values by hand. Based on the scatterplot, would you predict the correlation to be direct or indirect? Why?

2.Rank the following correlation coefficients on strength of their relationship (list the weakest first):

+.71

+.36

–.45

.47

–.62

3.Use IBM® SPSS® software to determine the correlation between hours of studying and grade point average for these honor students. Why is the correlation so low?

Hours of studyingGPA

233.95

123.90

154.00

143.76

163.97

213.89

143.66

113.91

183.80

93.89

4.Look at the following table. What type of correlation coefficient would you use to examine the relationship between ethnicity (defined as different categories) and political affiliation? How about club membership (yes or no) and high school GPA? Explain why you selected the answers you did.

Level of Measurement and Examples

Variable XVariable YType of correlationCorrelation being computed

Nominal (voting preference, such as Republican or Democrat)Nominal (gender, such as male or female)Phi coefficientThe correlation between voting preference and gender

Nominal (social class, such as high, medium, or low)Ordinal (rank in high school graduating class)Rank biserial coefficient The correlation between social class and rank in high school

Nominal (family configuration, such as intact or single parent)Interval (grade point average)Point biserialThe correlation between family configuration and grade point average

Ordinal (height converted to rank)Ordinal (weight converted to rank)Spearman rank correlation coefficientThe correlation between height and weight

Interval (number of problems solved)Interval (age in years)Pearson product-moment correlation coefficientThe correlation between number of problems solved and the age in years

5.When two variables are correlated (such as strength and running speed), it also means that they are associated with one another. But if they are associated with one another, then why does one not cause the other?

6.Given the following information, use Table B.4 in Appendix B of Statistics for People Who (Think They) Hate Statistics to determine whether the correlations are significant and how you would interpret the results.

a.The correlation between speed and strength for 20 women is .567. Test these results at the .01 level using a one-tailed test.

b.The correlation between the number correct on a math test and the time it takes to complete the test is –.45. Test whether this correlation is significant for 80 children at the .05 level of significance. Choose either a one- or a two-tailed test and justify your choice.

c.The correlation between number of friends and grade point average (GPA) for 50 adolescents is .37. Is this significant at the .05 level for a two-tailed test?

7.Use the data in Ch. 15 Data Set 3 to answer the questions below. Do this one manually or use IBM® SPSS® software.

a.Compute the correlation between income and level of education.

b.Test for the significance of the correlation.

c.What argument can you make to support the conclusion that lower levels of education cause low income?

8.Use the following data set to answer the questions. Do this one manually.

a.Compute the correlation between age in months and number of words known.

b.Test for the significance of the correlation at the .05 level of significance.

c.Recall what you learned in Ch. 5 of Salkind (2011) about correlation coefficients and interpret this correlation.

Age in monthsNumber of words known

126

158

94

75

1814

2418

157

166

2112

1517

9.How does linear regression differ from analysis of variance?

10.Betsy is interested in predicting how many 75-year-olds will develop Alzheimer’s disease and is using level of education and general physical health graded on a scale from 1 to 10 as predictors. But she is interested in using other predictor variables as well. Answer the following questions.

a.What criteria should she use in the selection of other predictors? Why?

b.Name two other predictors that you think might be related to the development of Alzheimer’s disease.

c.With the four predictor variables (level of education, general physical health, and the two new ones that you name), draw out what the model of the regression equation would look like.

11.Joe Coach was curious to know if the average number of games won in a year predicts Super Bowl performance (win or lose). The x variable was the average number of games won during the past 10 seasons. The y variable was whether the team ever won the Super Bowl during the past 10 seasons. Refer to the following data set:

TeamAverage no. of wins over 10 yearsBowl? (1 = yes and 0 = no)

Savannah Sharks121

Pittsburgh Pelicans110

Williamstown Warriors150

Bennington Bruisers121

Atlanta Angels131

Trenton Terrors160

Virginia Vipers151

Charleston Crooners90

Harrisburg Heathens80

Eaton Energizers121

a.How would you assess the usefulness of the average number of wins as a predictor of whether a team ever won a Super Bowl?

b.What’s the advantage of being able to use a categorical variable (such as 1 or 0) as a dependent variable?

c.What other variables might you use to predict the dependent variable, and why would you choose them?

Part B

Some questions in Part B require that you access data from Using SPSS for Windows and Macintosh. This data is available on the student website under the Student Text Resources link. The data for this exercise is in the data file named Lesson 33 Exercise File 1.

Peter was interested in determining if children who hit a bobo doll more frequently would display more or less aggressive behavior on the playground. He was given permission to observe 10 boys in a nursery school classroom. Each boy was encouraged to hit a bobo doll for 5 minutes. The number of times each boy struck the bobo doll was recorded (bobo). Next, Peter observed the boys on the playground for an hour and recorded the number of times each boy struck a classmate (peer).

1.Conduct a linear regression to predict the number of times a boy would strike a classmate from the number of times the boy hit a bobo doll. From the output, identify the following:

a.Slope associated with the predictor

b.Additive constant for the regression equation

c.Mean number of times they struck a classmate

d.Correlation between the number of times they hit the bobo doll and the number of times they struck a classmate

e.Standard error of estimate

Part C

Complete the questions below. Be specific and provide examples when relevant.

Cite any sources consistent with APA guidelines.

Draw a scatterplot of each of the following:

•A strong positive correlation

•A strong negative correlation

•A weak positive correlation

•A weak negative correlation

Give a realistic example of each.

What is the coefficient of determination? What is the coefficient of alienation? Why is it important to know the amount of shared variance when interpreting both the significance and the meaningfulness of a correlation coefficient?

If a researcher wanted to predict how well a student might do in college, what variables do you think he or she might examine? What statistical procedure would he or she use?

What is the meaning of the p value of a correlation coefficient?

Calculate the price
Pages (550 words)
\$0.00
*Price with a welcome 15% discount applied.
Pro tip: If you want to save more money and pay the lowest price, you need to set a more extended deadline.
We know how difficult it is to be a student these days. That's why our prices are one of the most affordable on the market, and there are no hidden fees.

Instead, we offer bonuses, discounts, and free services to make your experience outstanding.
How it works
Receive a 100% original paper that will pass Turnitin from a top essay writing service
step 1
Fill out the order form and provide paper details. You can even attach screenshots or add additional instructions later. If something is not clear or missing, the writer will contact you for clarification.
Pro service tips
How to get the most out of your experience with Australia Assessments
One writer throughout the entire course
If you like the writer, you can hire them again. Just copy & paste their ID on the order form ("Preferred Writer's ID" field). This way, your vocabulary will be uniform, and the writer will be aware of your needs.
The same paper from different writers
You can order essay or any other work from two different writers to choose the best one or give another version to a friend. This can be done through the add-on "Same paper from another writer."
Copy of sources used by the writer
Our college essay writers work with ScienceDirect and other databases. They can send you articles or materials used in PDF or through screenshots. Just tick the "Copy of sources" field on the order form.
Testimonials
See why 20k+ students have chosen us as their sole writing assistance provider
Check out the latest reviews and opinions submitted by real customers worldwide and make an informed decision.
Other
Michelle is a great writer! Assignment on time.
Customer 463427, October 1st, 2022
Statistics
Thank you for your neat and precise work, very professional
Customer 462485, May 22nd, 2022
Medicine
Properly format papers in the instructed style and always use Grammarly.
Customer 458101, April 10th, 2022
Psychology
Thank you.
Customer 463363, September 23rd, 2022
Management
Excellent. Thank you. I am grateful and I am thankful. I hope you have a wonderful day :)
Customer 454227, May 10th, 2020
English 101
Good job
Customer 454209, June 2nd, 2020
Humanities
On point.
Customer 463131, July 6th, 2022
Thank you!
Customer 453187, January 11th, 2022
project management
thank you
Customer 462327, November 16th, 2022
Political science
Great job God bless you
Customer 453983, February 4th, 2020
Other
This discussion paper is satisfactory and I will accept it "as is." There are changes that need to be made, but I will make them myself rather than requesting revisions and waiting hours for the completed work.
Customer 452455, February 22nd, 2023
Finance/Acc related
Excellent work.
Customer 460073, April 29th, 2022
11,595
Customer reviews in total
96%
Current satisfaction rate
3 pages
Average paper length
37%
Customers referred by a friend
OUR GIFT TO YOU
15% OFF your first order
Use a coupon FIRST15 and enjoy expert help with any task at the most affordable price.
Claim my 15% OFF Order in Chat