ࡱ> CEB kbjbjߍ 4,E%8",N,ttzz"www, #wwwwwE.EEEw^EwEEV@W0)p D0tT$E$WEWwwwEwwwt$wwwwwwwww :    San Jose State University School of Social Work ScWk 242 Lab Exercise #2: Independent t test (AKA Independent Samples t test) Answer Key Research Scenario The County Board of Supervisors in County A is considering eliminating funding for a program that provides Individualized Medication Support to individuals with chronic mental illness. The majority of the Board argues that a Group Medication Support program also being implemented in the County is equally effective and less expensive to operate. You are a County social worker working in the Individualized Medication Support program and you suspect that this program is more effective in reducing the number of emergency psychiatric hospitalizations experienced by clients in the program. Given the high cost of emergency psychiatric hospitalizations, you suspect that it is more cost-effective to maintain the Individualized Medication Support program than to eliminate it. You decide to examine administrative data from the county hospitals to compare the annual number of emergency psychiatric hospitalizations experienced by clients in the Group Medication Support (n=20), and the Individualized Medication Support (n=20) programs. Clients in each treatment condition were assigned to individual or group medication support based on availability of services. You will then present these results to the Board of Supervisors and describe the implications of your findings. Using an 8-Step Process for Hypothesis Testing Once you have your output, use the 8-step process for hypothesis testing to describe and interpret your findings. Please refer to the research scenario and your SPSS output to answer the questions. Identify the independent variable and level of measurement The independent variable is type of medication support (individual or group), and the level of measurement is categorical, nominal. Identify the dependent variable and level of measurement The dependent variable is annual number of emergency psychiatric hospitalizations and the level of measurement is continuous, interval/ratio. State the null hypothesis The null hypothesis is that there is no relationship between the type of medication support and the annual number of emergency psychiatric hospitalizations, specifically, there is no difference in the mean number of emergency psychiatric hospitalizations between those in the individual or group medication support programs. State the alternative hypothesis The alternative hypothesis is that there is a relationship between the type of medication support and the annual number of emergency psychiatric hospitalizations, specifically, there is a difference in the mean number of emergency psychiatric hospitalizations between those in the individual or group medication support programs. Identify the appropriate statistical test and alpha level The appropriate statistical test is the independent t test and the alpha level is .05 Present table of results (SPSS Output)   Describe results and decision to accept or reject the null hypothesis Results of the Levenes test for the equality of variances were non-significant (p=.891), and so the equal variances assumed line will be interpreted. t(36) = 2.324, p = .026 Since the p value of .026 is less than the alpha of .05, we reject the null hypothesis and conclude that there is a relationship between the type of medication support and annual emergency psychiatric hospitalizations. 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