PSYC 1010 Chapter Notes - Chapter 10: Confidence Interval, Normal Distribution, Pooled Variance
Document Summary
Independent sample t test- used to compare two means for a between-groups design, a situation in which each participant is assigned to only one condition. Uses a distribution of differences between means. Biggest difference that this makes- it takes more work to estimate the standard error. Looking at overall differences between two independent groups. We create a distribution of differences between means in order to establish that the distribution specifies the null hypothesis. 6 steps of an independent-samples t test: identify the populations, distribution, and assumptions, state the null and research hypothesis, determine the characteristics of the comparison distribution. There are three degrees of freedom calculations. First- calculate the degrees of freedom for the first sample- subtract 1 from the # of participants in the sample: dfx=n-1. Then- calculate the degrees of freedom for the second sample- subtract. 1 from the number of participants in that sample: dfy=n-1.
