PSYCH 2220H Chapter Notes - Chapter 8: Confidence Interval, Interval Estimation, Statistic
19 Aug 2016
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Chapter 8: confidence intervals, effect size, and statistical power. Confidence intervals: an interval estimate based on the sample statistic; includes the population mean a certain percentage of the time if we sample from the same population repeatedly. Centered around mean of sample: point estimates. A summary statistic from a sample that is just one number used as an estimate of the population parameter. Based on sample statistic and provides a range of plausible values for the population parameter: calculating confidence intervals with z distribution. Draw a picture of a distribution that will include the confidence interval. Indicate the bounds of the confidence interval on the drawing. Determine the z statistics that fall at each line marking the middle 95% Turn the z statistics back into raw means. Effect size: effect of sample size on statistical significance. Statistically significant: only means that those findings are unlikely to occur if in fact the null hypothesis is true.
