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Showing posts from May 1, 2011


Many analyses in psychological research involve testing hypotheses about means or mean differences. Below we describe the SPSS procedures that allow you to determine if a given mean is equal to either a fixed value or some other mean. One-sample t-test You perform a one-sample t-test when you want to determine if the mean value of a target variable is different from a hypothesized value. To perform a one-sample t-test in SPSS • Choose Analyze then goto Compare Means then goto One-sample t-test . • Move the variable of interest to the Test variable(s) box. • Change the test value to the hypothesized value. • Click the OK button. The output from this analysis will contain the following sections. • One-Sample Statistics . Provides the sample size, mean, standard deviation, and standard error of the mean for the target variable. • One-Sample Test . Provides the results of a t-test comparing the mean of the target variable to the hypothesized value. A significant test statistic indi