PSYC 355 SPSS HOMEWORK 2 INSTRUCTIONS: INDEPENDENT SAMPLES (40 POINTS) T TESTS Part One: Problem Set 1: The independent-samples t test File: Open \"Module 2 Exercise File 1\" found in Blackboard Course Content (Course Guides and Assignment Instructions Assignment InstructionsSPSS HomeworkSPSS Homework 2 Files). Research Scenario: A clinical psychologist wants to study the effect of session length on treatment satisfaction for adults in a community clinic who present with internalizing disorders. She randomly selects a sample of 20 clients and assigns them to two groups, a \"Short session group\" which receives ten 30minute sessions over 3 months (n =10), and a \"Long session group\" which receives seven 45-minute sessions over 3 months (n = 10). Clients rate their satisfaction at the end of treatment on a scale of 1-10, with 1 being completely unsatisfied and 10 being completely satisfied. Conduct an independent-samples t test to determine whether there is a difference in treatment satisfaction depending on session length. 1. Paste SPSS output. (3 pts.) 2. Beneath your output, write the answers to the following questions: a. What are the t and p values for \"equal variances assumed\"? (3 pts) i. t = .261, p = .797 b. What is the mean satisfaction score for the \"Short\" group? (3 pts) i. 6.60 Page 1 of 5 PSYC 355 3. Write an APA-style Results section based on your analyses. All homework \"Results sections\" should follow the example given in the SPSS tutorials. Remember to include a decision about the null hypothesis. (3 pts.) a. An independent samples t test was was conducted to evaluate whether session length had an effect on treatment satisfaction for adults in a community clinic who suffer from internalizing disorders. Two testing conditions were used: a short session format (ten 30min sessions) and a long session format (45min sessions). Both were conducted over a span of three months. The test, t (18) = .261, p = . 797, demonstrated that the group who received shorter sessions (M = 6.60, SD = 1.506) reported similar rates of satisfaction as the group who received longer sessions (M = 6.40, SD = 1.897). Therefore, there was no significant difference between the groups. Hence, we fail to reject the null hypothesis that there would be no significant difference between the two groups' satisfaction scores. 4. Create a boxplot to illustrate the difference between the treatment satisfaction levels of the two groups. (3 pts.) Page 2 of 5 PSYC 355 Part Two: Problem Set 1: The independent-samples t test Research Scenario: A social psychologist working for a marketing department wants to study the effect of scenario descriptions on charitable giving to a child hunger organization. He devises two scenarios: one in which an employee of the charity describes child hunger using facts and information (Group 1), and one in which an employee of the charity describes child hunger using an anecdotal example with one \"identifiable victim\" (Small, 2016) (Group 2). Eight people are interviewed in each group. After hearing the employee read the child hunger scenario, the participants are then asked to state how much money they would donate to the charity to help end child hunger. The data appear in the table below. Conduct an independent-samples t test to determine whether there a difference in the amount of money between the two groups. Factual Informative Scenario 25 10 25 15 10 20 32 15 Anecdotal \"Identifiable Victim\" Scenario 10 15 15 35 30 50 45 30 1. Paste appropriate SPSS output. (4 pts.) 2. Paste appropriate SPSS graph. (4 pts.) 3. Write an APA-style Results section based on your analyses. All homework \"Results sections\" should follow the example given in the SPSS tutorials. Remember to include a decision about the null hypothesis. (4 pts.) Part Three: Cumulative Homework Page 3 of 5 PSYC 355 Problem Set 1: Choose the correct method from tests learned in previous modules. Research Scenario: A developmental psychologist is studying attachment in a sample of 10 toddlers in a local preschool. She uses a measure on which higher scores indicate more secure attachments to caregivers, and the data a. The population mean on this measure is 24.5. Is there a difference between the psychologist's sample and the general population on attachment security? Attachment Security 12.5 23 32 24.5 19.5 17 13.5 23 27.5 32 a. Paste appropriate SPSS output. (4) One-Sample Statistics N VAR00001 Mean 22.4500 10 Std. Deviation 6.91396 Std. Error Mean 2.18638 One-Sample Test Test Value = 24.5 t VAR00001 df -.938 9 Sig. (2tailed) .373 Mean Difference -2.05000 95% Confidence Interval of the Difference Lower Upper -6.9959 2.8959 Page 4 of 5 PSYC 355 b. Paste appropriate SPSS graph. (4) c. Write an APA-style Results section based on your analyses. All homework \"Results sections\" should follow the example given in the SPSS tutorials and the Course Content document \"Writing Results of Statistical Tests in APA Format\" (note: you do not have to refer to a figure). Remember to include a decision about the null hypothesis. a. A one sample t test was conducted to evalutate whether the mean attachment scores for toddlers was different from 24.5, the mean attachment score for the general population. The sample of mean of 22.45 (SD = 6.91) was not significantly different than that of the general population. The results of the test indidcated that there was no significant difference between the means, t (9) = -.938, p = .187. Therefore, we accept the null hypothesis that there would be no significant difference in the attachment scores of the selected group of toddlers as compared to the general population. Submit this assignment by 11:59 p.m. (ET) on Monday of Module/Week 2. Page 5 of 5