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Unformatted text preview: 61 Numerical SummariesDefinition: Sample Mean61 Numerical Summaries Example 6161 Numerical Summaries Figure 61The sample mean as a balance point for a system of weights.61 Numerical Summaries Population MeanFor a finite population with Nmeasurements, the mean isThe sample meanis a reasonable estimate of the population mean.61 Numerical Summaries Definition: Sample Variance61 Numerical Summaries How Does the Sample Variance Measure Variability?Figure 62How the sample variance measures variability through the deviations .xxi61 Numerical Summaries Example 6261 Numerical Summaries 61 Numerical Summaries Computation of s261 Numerical Summaries Population VarianceWhen the population is finite and consists of N values, we may define the population varianceasThe sample varianceis a reasonable estimate of the population variance.61 Numerical Summaries Definition62 StemandLeaf Diagrams Steps for Constructing a StemandLeaf Diagram62 StemandLeaf Diagrams Example 6462 StemandLeaf Diagrams 62 StemandLeaf Diagrams Figure 64Stemandleaf diagram for the compressive strength data in Table 62. 62 StemandLeaf Diagrams Example 6562 StemandLeaf Diagrams Figure 65Stemandleaf displays for Example 65. Stem: Tens digits. Leaf: Ones digits. 62 StemandLeaf Diagrams Figure 66Stemandleaf diagram from Minitab. Data FeaturesThe medianis a measure of central tendency that divides the data into two equal parts, half below the median and half above. If the number of observations is even, the median is halfwaybetween the two central values....
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 Spring '10
 Zhai

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