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Unformatted text preview: 9/22/2007 1 61 Numerical Summaries Definition: Sample Mean 61 Numerical Summaries Example 61 61 Numerical Summaries Figure 61 The sample mean as a balance point for a system of weights. 61 Numerical Summaries Population Mean For a finite population with N measurements, the mean is The sample mean is a reasonable estimate of the population mean . 61 Numerical Summaries Definition: Sample Variance 9/22/2007 2 61 Numerical Summaries How Does the Sample Variance Measure Variability? Figure 62 How the sample variance measures variability through the deviations . x x i − 61 Numerical Summaries Example 62 61 Numerical Summaries 61 Numerical Summaries Computation of s 2 61 Numerical Summaries Population Variance When the population is finite and consists of N values, we may define the population variance as The sample variance is a reasonable estimate of the population variance . 61 Numerical Summaries Definition 9/22/2007 3 62 StemandLeaf Diagrams Steps for Constructing a StemandLeaf Diagram 62 StemandLeaf Diagrams Example 64 62 StemandLeaf Diagrams 62 StemandLeaf Diagrams Figure 64 Stemand leaf diagram for the compressive strength data in Table 62. 62 StemandLeaf Diagrams Example 65 62 StemandLeaf Diagrams Figure 6 5 Figure 65 Stemand leaf displays for Example 65. Stem: Tens digits. Leaf: Ones digits. 9/22/2007 4 62 StemandLeaf Diagrams Figure 66 Stem andleaf diagram from Minitab. Data Features • The median is 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 halfway between the two central values....
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This note was uploaded on 02/05/2012 for the course ST 315 taught by Professor Staff during the Fall '11 term at S. Alabama.
 Fall '11
 Staff

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