basicstatisticsuseofminitab(编辑修改稿)

basicstatisticsuseofminitab(编辑修改稿)内容摘要：

Belton Confidential: For training only 16 Interquartile range  The interquartile range is another measure of dispersion. IQR = Q3 Q1  The interquartile range is less sensitive to extreme values in a sample than the range.  For the two samples (1, 3, 5, 8, 9 and 1, 5, 5, 5, 9), their interquartile ranges are 5 and 0 respectively. Belton Confidential: For training only 17 Measure of Shape Skewness  Skewness  The degree of assymmetry of a distribution around its mean is referred to as its skewness. Belton Confidential: For training only 18 Measure of Shape Kurtosis  Kurtosis  Kurtosis characterizes the relative peakedness or flatness of a distribution pared to a normal (mesokurtic) distribution. Belton Confidential: For training only 19 MiniTab’s Descriptive Statistics  Stat  Basic Statistics  Display Descriptive Statistics  produces statistics for each column of data (or subsets within a column) and displays them in the Session Window and optionally in a graph  the user has no control over which statistics are puted/displayed  Stat  Basic Statistics  Store Descriptive Statistics  descriptive statistics for each column (or subsets within a column) are displayed in adjacent columns within the Worksheet  the user can select which statistics are to be puted/displayed, but has no control over the order in which they are displayed  Instructor will show you the method of using Minitab. Belton Confidential: For training only 20 Graphical Presentation Visual interpretation the the data set. Common graphical tools to illustrate a data set:  Dot Plot  Box Plot  Histogram  Stem amp。 Leaf Diagram Belton Confidential: For training only 21 Dot Plot  The dot plot is useful for displaying a small body of data.  The location or central tendency in the data set and its spread or dispersion are easily identified.  It can also be used in paring two or more data sets. Belton Confidential: For training only 22 Dot Plot The pull strength of bonding wires from two suppliers are shown below A : B : The Dot Plot reveals that wires from supplier A seems to result in lower pull strength , but the variability within both groups is about the same. Suppl i。