SPSS ASSIGNMENT #5 Tests for Two Independent (or Different) Groups (or Samples) To run the t Test for Independent Samples: ****You can also follow the steps in pages 200-203 of your text. Once you have entered the data, click on Analyze, then on Compare Means, and then click on Independent-Samples T Test? A dialog box will appear, with your variables (student, condition, score) on the left. Your options are (a) move one or more variables into the ?Test Variable(s)? box to select your dependent variables(s) and (b) move one of your variables into the ?Grouping Variable? box to select the independent variables (or identify the groups to be compared). Make ??? the dependent variable by moving it to the ?Test Variable(s)? box. Then make ??? your independent variable by moving it to the ?Grouping Variable? box. Now, the ?Define Groups? button is functioning, click on Define Groups and another dialog box appears. Here you must specify the two values of the condition variable that represent the two groups you are comparing. Click in the box next to Group 1 and type the number 1, then click in the box next to Group 2 and type the number 2. Now you can click Continue to return to the ?Independent-Samples T Test? dialog box, and click on OK to run the analysis. 1. Enter the data named Chapter 11 Data Set 2 (pp. 372-373). a. Identify and test the research hypothesis at the .05 level of significance that boys raise their hands in class more often than girls. Remember to first decide whether this is a one- or two-tailed test. What is your conclusion regarding the research hypothesis? Copy and paste the results in this document. b. Using the data set Chapter 11 Data Set 2, test the research hypothesis at the .01 level of significance that there is a difference between boys and girls in the number of times they raise their hands in class. What is your conclusion regarding the research hypothesis? Copy and paste the results below. c. You used the same data for both parts a and b, but you have a different hypothesis (one is directional and the other is nondirectional). How do the results differ and why? 2. Enter the data below, and then complete the tasks and/or answer the following questions. In-Home Treatment Out-of-Home Treatment 3 7 4 6 1 7 1 8 1 7 3 6 3 5 6 6 5 4 1 2 4 5 5 4 4 3 4 6 3 7 6 5 7 4 7 3 7 8 8 7 a. Write a brief paragraph about whether the in-home counseling is equally effective as the out-of-home treatment for two separate groups. The outcome variable is level of anxiety after treatment on a scale from 1 to 10. Copy and paste your results below. 3. Using the data named Chapter 11 Data Set 4 (p. 374) test the null hypothesis that there is no difference in group means between the number of words spelled correctly for two groups of fourth graders? What is your conclusion? Copy and paste your results below. Tests Between the Means of Related Groups Review and follow the steps in pages 214-217 or your text. 4. For the data set Chapter 12 Data Set 2 (p. 375), compute the t value using SPSS and write a conclusion as to whether there was a change in tons of paper used as a function of the recycling program in 25 different districts. (Hint: before and after become the two levels of treatment). Test the hypothesis at the .01 level. Copy and paste the results below. 5. For the dataset Chapter 12 Data Set 3 (p. 376), compute the t value and write a conclusion as to whether there is a difference in satisfaction level in a group of families? use of service centers following a social service intervention on a scale from 1 to 15. Report the exact probability of the outcome. Copy and paste the results below.
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