Psych 243 1st Edition Lecture 6Outline of Last Lecture I. Frequency Distributiona. Mean, Median & Mode in Frequency DistributionII. Variabilitya. Different Ways to Measure Variabilityb. Deviation from the Meanc. Formulasd. Population Variancee. Sample Variance & Sample Standard Deviationf. What Does S^2 Mean?g. Interpreting Standard Deviationh. Unbiased Estimator of σi. Why is N-1 in the Denominator?j. What to Use and When to Use itOutline of Current Lecture I. Interpreting Variability with a Normal DistributionII. Test InfoCurrent LectureInterpreting Variability with a Normal DistributionThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- In normal distribution, approximately 68% of scores will fall within 1 standard deviation of the mean- 95% of the scores will fall into 2 standard deviations of mean- 99.7% will fall within 3 Standard deviations- Scores beyond 3 deviations are very rareTest Info- NO area under curve or percentile calculation- About half multiple choice, less than half short answer- 25 questions- NEED TO KNOW: STANDARD DEVIATION, MEAN, FREQUENCY DISTRIBUTION CHARTS, VARIANCE- FORMULAS WILL BE