PSYCH 625 Week 5 Individual Assignment Programmatic Assessment Time to Practice – Week Five
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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
Compute the Pearson productmoment correlation coefficient by hand and show all your work
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)
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
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
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
The correlation between speed and strength for 20 women is .567. Test these results at the .01 level using a onetailed test
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 twotailed test and justify your choice
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 twotailed 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
Compute the correlation between income and level of education
Test for the significance of the correlation
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
Compute the correlation between age in months and number of words known
Test for the significance of the correlation at the .05 level of significance
Recall what you learned in Ch. 5 of Salkind (2011) about correlation coefficients and interpret this correlation
9. How does linear regression differ from analysis of variance
10. Betsy is interested in predicting how many 75yearolds 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
What criteria should she use in the selection of other predictors? Why
Name two other predictors that you think might be related to the development of Alzheimer’s disease
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
How would you assess the usefulness of the average number of wins as a predictor of whether a team ever won a Super Bowl
What’s the advantage of being able to use a categorical variable (such as 1 or 0) as a dependent variable
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).
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
Slope associated with the predictor
Additive constant for the regression equation
Mean number of times they struck a classmate
Correlation between the number of times they hit the bobo doll and the number of times they struck a classmate
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
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Complete both Part A and Part B below.
Part A
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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. Why is a z ..

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Part A
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1. By hand, compute the mean, median, and mode for the following se..

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For each of the tests of reliability and validity listed on the matrix, prepare a 50 to 100word description of the test’s application. Describe what conditions these reliability types would be used for as well as when they would be inappropriate. Then, for each test, prepare a 50 to 100word d..

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Cite any sources consistent with APA guidelines.
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