Comparing Dependent Samples SPSS Open the Questionnaire Data Recoded.sav file from the Open Science Framework at hitps://osf.io/5qv2p. Purpose In this assignment, you will compare the number of dogs and cats that students own by calculating a dependent samples t-test and a confidence interval for the difference of the means, and then you will interpret your findings. Set-uj 1. Download and open the Questionnaire Data Recoded.sav file from the Open Science Framework at https://osf.io/5qy2p 2. Edit the Options to hide the notes, show the titles, and NOT display commands in the log. 3. Add your first and last name. the course number, the assignment name, and the date in a comment at the top of your Syntax file. Add the same information in a title at the top of your Output file, by creating and then Running syntax commands. Because SPSS titles in Output files are limited to 60 characters, shorten the assignment name to “Dependent Samples™. 4. Save your Syntax file as “Dependent Samples [Last Name] Syntax”. 5. Save your Output file as “Dependent Samples [Last Name] Output”. Part A: Comparing the Mean Number Cats and Dogs owned by Students 1. Add a comment to your Syntax file, describing what this section is doing. The comment should include the name of this section, but can also include additional information. 2. Add a title to your Output file, describing what this section does, using syntax commands. Run your syntax commands. 3. Click Analyze. 4. Click on Compare Means from the drop down menu. s. 6. Click on Paired-Samples T Test from the side menu. Select the variables dogs (“How many dogs do you own?”) and cats (“How many cats do you own?”) and click the right arrow to move them into the box that says Paired Variables. Do NOT click PASTE yet. 7. To calculate a 95% confidence interval for the difference of the means, click Options. Make sure it says 95%. Click Continue. 8. Click Paste and Run your syntax commands. 9. Save your Syntax and Output files. Part B: Interpreting Your OQutput 1. Add a comment to your Syntax file, describing what this section is doing. The comment should include the name of this section, but can also include additional information. 2. Add a title to your Output file, describing what this section does, using syntax commands. Run your syntax commands. 3. Look at the example output for a paired-samples t-test on the next page. Then answer the following questions about the data analysis that you just did in Part A. Insert your answers to these questions into your Output file by using ECHO commands in your Syntax file. For each of your answers, write the letter of the question you are answering. Each time you create an ECHO command, immediately Run that ECHO command and check your Output file to make sure that the text you echoed shows up. Since ECHO commands have word limits, you may need to use multiple ECHO commands on separate lines for some of your answers. ‘What was the null hypothesis? Answer this question twice, first with words and then with symbols. What was the alternative hypothesis? Answer this question twice, first with words and second with symbols. What was the mean number of dogs owned in this sample? ‘What was the mean number of cats owned in this sample? ‘What was the value of t-observed? What are the degrees of freedom? What was the p-value? Would you retain or reject the null hypothesis? ‘What are the lower and upper limits of the 95% confidence interval for the difference of the means? ‘Write a sentence explaining the results of your dependent samples t-test. Include your statistical results in APA format: (#(df) = t-observed. p = p-value observed. 95% CI [lower limit, upper limit]). Remember to round t-observed and confidence interval limits to two decimals, but give all three decimals for the p-value. Write another sentence explaining the results of your confidence interval. k. Write one sentence describing your conclusions. Your conclusions are your personal opinions about why you got the results you did, or the implications of these results for the real world. 4. Export your visible output to PDF format, saving it as “Dependent Samples Last Name Output”. 5. Print your Syntax file to PDF format, saving it as “Dependent Samples Last Name Syntax”. TrE@ e a0 o WHAT YOU SHOULD HAND IN Hand in your Syntax and Output files (both in PDF format).
