Part 1:

Note: The z-scoring method used in the practice data file is covered. You will use raw data for all homework exercises, with no need to convert to z scores.

Green & Salkind:

The following helpful tips are numbered to correspond with the exercise number to which they refer:

1. Use raw scores, not z scores, in the regression analysis.

a. Slope associated with the predictor:

b. Additive constant for the regression equation:

c. Mean number of times children struck a classmate:

d. Correlation between the number of times they hit bobo doll and the number of times they hit a peer:

e. Standard error of the estimate:

3. Write the answer to the last part of this question beneath your graph, in sentence form.

4. All homework Results sections must follow the example given in the SPSS tutorial presentations and the Course Content document "Writing Results of Statistical Tests in Current APA Format" (note: you do not have to refer to a figure). Note: The statistical statement for a bivariate linear regression must include at least the equation of the line and the confidence interval for the slope (the second row under Confidence Intervals in the output), as well as a decision about the null hypothesis.

Part 2:

1. An educational psychologist is interested in whether after-school clubs improve performance in certain activities. Specifically, she wants to evaluate whether the number of hours spent per week in an after-school chess club predicts the score in a year-end district-wide chess tournament. She collects the number of hours spent per week by each child in the chess clubs of 3 different schools. She then records their scores at the year-end chess tournament, where a win is worth 3 points, a draw is worth 1 point, a loss is worth 0 points, and each child plays multiple games. She compiles the information in the table below. Conduct a bivariate linear regression to analyze the research question.

The steps will be the same as the ones you have been practicing in Part 1 of the assignment-the only difference is that you are now responsible for creating the data file as well. Remember to name and define your variables under the "Variable View," then return to the "Data View" to enter the data.

a) Paste the SPSS output.

b) Construct a scatterplot of the relationship between the 2 variables. Plot the regression line on this graph.

c) Is hours in after-school chess club predictive of chess tournament scores in this sample? Write a Results section in current APA style describing the outcome. All homework Results sections must follow the example given in the SPSS tutorial presentation and the Course Content document "Writing Results of Statistical Tests in Current APA Format" (note: you do not have to refer to a figure). The statistical statement for a bivariate linear regression must include at least the equation of the line and the confidence interval for the slope (the second row under Confidence Intervals in the output), as well as a decision about the null hypothesis.

Part 3: Cumulative Homework

1. A neuropsychologist is assessing the relationship between visual attention levels and the ability to multitask in a sample of 14 patients. He administers a visual continuous performance test to assess levels of visual attention on which scores can range from 1 to 20: a high score indicates better visual attention levels. He then has each patient complete a task that requires high levels of multitasking. Errors are counted, and a high number of errors indicates poor multitasking skills. The scores are listed in the table below. Choose the correct test to analyze this question, set up the SPSS file, and run the analysis. Follow the directions under the table below.

The steps will be the same as the ones you have been practicing in Part 1 of the assignment-the only difference is that you are now responsible for creating the data file as well. Remember to name and define your variables under the "Variable View," then return to the "Data View" to enter the data.

a) Paste the appropriate SPSS output.

b) Paste the appropriate SPSS graph.

c) Write a current APA-style Results section based on your analyses. All homework Results sections must follow the example given in the SPSS tutorials and the Course Content document "Writing Results of Statistical Tests in Current APA Format" (note: you do not have to refer to a figure). Remember to include a decision about the null hypothesis.