PSYC 1010 Lecture Notes - Confidence Interval, Interval Estimation, Null Hypothesis
3 Jun 2013
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Chapter 8: confidence intervals, effect size, and statistical power. Point estimate: a summary statistic from a sample that is just one number used as an estimate of the population parameter. Interval estimate: based on a sample statistic and provides a range of plausible values for the population parameter. Confidence interval: an interval estimate, based on the sample statistic, that includes the population mean a certain percentage of the time, were we to sample from the same population repeatedly. Step 1: draw a picture of a distribution that will include the confidence interval. Step 2: indicate the bounds of the confidence interval on the drawing. Step 3: determine the z statistics that fall at each line marking the middle 95% Step 4: turn the z statistic back into raw means. Step 5: check that the cis make sense. The effect of sample size on statistical significance.
