QMS 202 Study Guide - Midterm Guide: Multiple Comparisons Problem, Null Hypothesis, Location Test

• School: Ryerson University
• Department: Quantitative Methods
• Course: QMS 202
• Professor: Nursel Ruzgar

Document Summary

Assume that the populations are normally-distributed with equal t. 1n + 2n - 2 degrees of freedom. or stat. 1s , we always input the larger value. If the variances are equal (in case variances are not equal (in case. 0h is rejected), use the separate variance t-test. 0h is not rejected), use the pooled variance t-test. Reject (n-1) degrees of freedom d - hypothesized mean difference = 0, d - mean of the differences, ds - standard deviation of the. 0h , when or > p-value. t t or. 1x - number of items of interest in. < lower-tail critical value or > p-value. F-test for differences among more than two means. Assume: groups are randomly/independently selected from normal populations with equal variances, are equal ( i. Use multiple comparisons to determine which means are different from others(using spss). 0h : the means are not different, ah : the means are different.