# QMS 202 Lecture : Lecture 5

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17 Apr 2011
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## Document Summary

Objectives: comparing the means of two independent. Two means: comparing the means of two related populations, comparing two population proportions. Z-test: f-test for the difference between two variances. Independent samples: the samples chosen at random are. There are two types of dependent samples: characterized by a measurement, characterized by matching or followed by an intervention of some type, and then another measurement, called a before and after study, example: Suppose we want to show that, by placing speakers in the production area and playing soothing music, we are able to increase we are able to increase production. We begin by selecting a sample of workers and measuring their output under current conditions, The speakers are then installed in the production area, and we again measure the output of the same workers. There are 2 measurements: (1) before placing the speakers (2) after placing the speakers. pairing of the observations: example:

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