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Statistics: Unlocking the Power of DataLock5Section 5.1Normal Distribution
Statistics: Unlocking the Power of DataLock5OutlineDensity curvesNormal distributionFinding normal probabilities (technology)Finding normal endpoints (technology)Standard normal
Statistics: Unlocking the Power of DataLock5Some Bootstrapand Randomization Distributionsslope(thousandths)-60-40-200204060Dot Plotr-0.4-0.20.00.20.40.6Nullxbar98.298.398.498.598.698.798.898.999.0Diff-4-3-2-101234xbar26272829303132Dot PlotSlope :Restaurant tipsCorrelation: Malevolent uniformsMean :Body TemperaturesDiff means: Finger tapsMean : Atlanta commutesphat0.30.40.50.60.70.8Proportion : Owners/dogsAll bell-shaped distributions
Statistics: Unlocking the Power of DataLock5Density CurveA density curve is a theoretical model to describe a variable’s distribution.Think of a density curve as an idealized histogram, where:(1) The total area under the curve is one.(2) The proportion of the population in any interval is the areaover that interval.
Statistics: Unlocking the Power of DataLock5Density for Bootstrap Means for Atlanta CommutesWhat proportion are between 30 and 31?