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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 product-moment 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 one-tailed 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 two-tailed 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 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

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 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

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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