1PSY207BSpring 2011Psychological StatisticsXII. Estimation12.1 OverviewEstimation• We have previously discussed testing hypotheses about a population mean • We may also be interested in estimating a population mean • To determine the size of an effect • How much will treatment affect the mean • To determine information about a population • We can use sample characteristicsand test statistics(e.g., zand t) to estimate population means ☻☻☻☻Hypothesis testingEstimating population meansIs there a effect?How much of the effect?XII. Estimation12.1 Introduction12.2 Two Types of EstimatesTwo types of Estimates• Point estimates• Use a single number to predict an unknown value• Interval estimates• Use a range of values to predict an unknown quality• Confidence Intervals: the specific level of confidence/probability the interval estimate comes with• Based on zor t
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