PSYC2203 Chapter Notes - Chapter 7: Statistical Parameter, Explained Variation, Dependent And Independent Variables
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Chapter 7: statistical significance, effect size, and confidence intervals. On a 10-point scale, i find that the men liked the movie two points more, on average, than the women. Or is the difference in my samples just due to random sampling error: the difference between my sample means is 2 points. The standard error of the difference between the means is 1 point. So the difference between my sample means is about twice as large as the difference i would expect to get just due to random sampling error. Limitations of hypothesis testing: it is designed to answer yes-or-no questions. I want to build a 95% confidence interval: ci95 = 10 (t c)(1, to find t c i look in appendix b, 24 degrees of freedom, alpha level of . 05 2-tailed, this value is 2. 064. Larger confidence intervals indicate greater amounts of error in the sample estimate of the population parameter.
