PLG 310 Chapter 10: week 11: Chapter 10 notes
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We use sample standard deviation (s) instead of o. Because we are using a standardized distribution with different variances, the sampling. In this case, we are getting two values from the sample, the mean x and standard deviation (s) distribution of the sample mean will be different than a standard normal distribution. We need two samples to compare two populations. Dependent samples: if the same set of sources or related sets are used to obtain the data representing both populations. Independent samples: if two unrelated sets of sources are used, one set from each population. Example: downtown revitalization (e. g. , regent park, question: does the urban livability improve after the project implementation, solution: comparison across samples. The procedure for comparing two population means are based on the relationship between two sets of sample data, both sampled from the same or related sources.
