PSY201H1 Chapter Notes - Chapter 7: Normal Distribution, Statistic, Statistical Parameter
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Whenever a score is selected from a population, you should be able to compute a z-score that describes exactly where the score is located in the distribution. Any score located in the tail of the distribution beyond z = +2. 00 or z = -2. 00 is an extreme value. A score this large has a probability of only p = 0. 0228. Thus it is possible to describe how any specific sample is related to all other possible samples. We ccan use the z-score value to find the probability of obtaining a specific sample, no matter how many scores the sample contains. In the case where the sample consists of a larger sample (not just a single score): The sample mean is used to answer questions about the population. Transforming a sample mean into a z-score. Thus a researcher is ablt to compute a z-score that describes an entire population.
