PSYC 2040 Chapter Notes - Chapter 2: Repeated Measures Design, Central Limit Theorem, Standard Deviation
10 Jan 2016
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How reasonable it is to assume that a sample originated from a population with a given mean. How reasonable it is that the two samples came from populations with identical means. Standard normal distribution such that 95% of the area lies between 1. 96 and + 1. 96 would be significant at the . 05 (probability of a type 1 error at this level is . 05) Standard normal distribution such that 99% of the area lies between 2. 58 and + 2. 58 would be significant at the . 01 level (probability of a type 1 error at this level is . 01. Used to determine how likely it is that a sample with a given mean (statistic) could originate from a population with a given mean (parameter) Can only do this if it is normally distributed, if the sample is large enough you can assume it is because of the central limit theorem.
