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Summary
Summary
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Master the Statistical Techniques for Six Sigma Operations, While Boosting Your Excel and Minitab Skills!
Now with the help of this "one-stop" resource, operations and production managers can learn all the powerful statistical techniques for Six Sigma operations, while becoming proficient at Excel and Minitab at the same time.
Six Sigma Statistics with Excel and Minitab offers a complete guide to Six Sigma statistical methods, plus expert coverage of Excel and Minitab, two of today's most popular programs for statistical analysis and data visualization.
Written by a seasoned Six Sigma Master Black Belt, the book explains how to create and interpret dot plots, histograms, and box plots using Minitab...decide on sampling strategies, sample size, and confidence intervals...apply hypothesis tests to compare variance, means, and proportions...conduct a regression and residual analysis...design and analyze an experiment...and much more.
Filled with clear, concise accounts of the theory for each statistical method presented, Six Sigma Statistics with Excel and Minitab features:
Easy-to-follow explanations of powerful Six Sigma tools A wealth of exercises and case studies 200 graphical illustrations for Excel and MinitabEssential for achieving Six Sigma goals in any organization, Six Sigma Statistics with Excel and Minitab is a unique, skills-building toolkit for mastering a wide range of vital statistical techniques, and for capitalizing on the potential of Excel and Minitab.
Six Sigma Statistical with Excel and Minitab offers operations and production managers a complete guide to Six Sigma statistical techniques, together with expert coverage of Excel and Minitab, two of today's most popular programs for statistical analysis and data visualization.
Written by Issa Bass, a Six Sigma Master Black Belt with years of hands-on experience in industry, this on-target resource takes readers through the application of each Six Sigma statistical tool, while presenting a straightforward tutorial for effectively utilizing Excel and Minitab. With the help of this essential reference, managers can:
Acquire the basic tools for data collection, organization, and description Learn the fundamental principles of probability Create and interpret dot plots, histograms, and box plots using Minitab Decide on sampling strategies, sample size, and confidence intervals Apply hypothesis tests to compare variance, means, and proportions Stay on top of production processes with statistical process control Use process capability analysis to ensure that processes meet customers' expectations Employ analysis of variance to make inferences about more than two population means Conduct a regression and residual analysis Design and analyze an experimentAuthor Notes
Issa Bass is a Six Sigma Master Black Belt and Six Sigma project leader for Kenco Group, Inc. He is the founding editor of SixSigmaFirst.com.
Table of Contents
Preface | p. ix |
Acknowledgments | p. x |
Chapter 1 Introduction | p. 1 |
1.1 Six Sigma Methodology | p. 2 |
1.1.1 Define the organization | p. 2 |
1.1.2 Measure the organization | p. 6 |
1.1.3 Analyze the organization | p. 11 |
1.1.4 Improve the organization | p. 13 |
1.2 Statistics, Quality Control, and Six Sigma | p. 14 |
1.2.1 Poor quality defined as a deviation from engineered standards | p. 15 |
1.2.2 Sampling and quality control | p. 16 |
1.3 Statistical Definition of Six Sigma | p. 16 |
1.3.1 Variability: the source of defects | p. 17 |
1.3.2 Evaluation of the process performance | p. 18 |
1.3.3 Normal distribution and process capability | p. IS |
Chapter 2 An Overview of Minitab and Microsoft Excel | p. 23 |
2.1 Starting with Minitab | p. 23 |
2.1.1 Minitab's menus | p. 25 |
2.2 An Overview of Data Analysis with Excel | p. 33 |
2.2.1 Graphical display of data | p. 35 |
2.2.2 Data Analysis add-in | p. 37 |
Chapter 3 Basic Tools for Data Collection, Organization and Description | p. 41 |
3.1 The Measures of Central Tendency Give a First Perception of Your Data | p. 42 |
3.1.1 Arithmetic mean | p. 42 |
3.1.2 Geometric mean | p. 47 |
3.1.3 Mode | p. 49 |
3.1.4 Median | p. 49 |
3.2 Measures of Dispersion | p. 49 |
3.2.1 Range | p. 50 |
3.2.2 Mean deviation | p. 50 |
3.2.3 Variance | p. 52 |
3.2.4 Standard deviation | p. 54 |
3.2.5 Chebycheff's theorem | p. 55 |
3.2.6 Coefficient of variation | p. 55 |
3.3 The Measures of Association Quantify the Level of Relatedness between Factors | p. 56 |
3.3.1 Covariance | p. 56 |
3.3.2 Correlation coefficient | p. 58 |
3.3.3 Coefficient of determination | p. 62 |
3.4 Graphical Representation of Data | p. 62 |
3.4.1 Histograms | p. 62 |
3.4.2 Stem-and-leaf graphs | p. 64 |
3.4.3 Box plots | p. 66 |
3.5 Descriptive Statistics-Minitab and Excel Summaries | p. 68 |
Chapter 4 Introduction to Basic Probability | p. 73 |
4.1 Discrete Probability Distributions | p. 74 |
4.1.1 Binomial distribution | p. 74 |
4.1.2 Poisson distribution | p. 79 |
4.1.3 Poisson distribution, rolled throughput yield, and DPMO | p. 80 |
4.1.4 Geometric distribution | p. 84 |
4.1.5 Hypergeometric distribution | p. 85 |
4.2 Continuous Distributions | p. 88 |
4.2.1 Exponential distribution | p. 88 |
4.2.2 Normal distribution | p. 90 |
4.2.3 The log-normal distribution | p. 97 |
Chapter 5 How to Determine, Analyze, and Interpret Your Samples | p. 99 |
5.1 How to Collect a Sample | p. 100 |
5.1.1 Stratified sampling | p. 100 |
5.1.2 Cluster sampling | p. 100 |
5.1.3 Systematic sampling | p. 100 |
5.2 Sampling Distribution of Means | p. 100 |
5.3 Sampling Error | p. 101 |
5.4 Central Limit Theorem | p. 102 |
5.5 Sampling from a Finite Population | p. 106 |
5.6 Sampling Distribution of p | p. 106 |
5.7 Estimating the Population Mean with Large Sample Sizes | p. 108 |
5.8 Estimating the Population Mean with Small Sample Sizes and [sigma] Unknown: t-Distribution | p. 113 |
5.9 Chi Square (x[superscript 2]) Distribution | p. 114 |
5.10 Estimating Sample Sizes | p. 117 |
5.10.1 Sample size when estimating the mean | p. 117 |
5.10.2 Sample size when estimating the population proportion | p. 118 |
Chapter 6 Hypothesis Testing | p. 121 |
6.1 How to Conduct a Hypothesis Testing | p. 122 |
6.1.1 Null hypothesis | p. 122 |
6.1.2 Alternate hypothesis | p. 122 |
6.1.3 Test statistic | p. 123 |
6.1.4 Level of significance or level of risk | p. 123 |
6.1.5 Decision rule determination | p. 123 |
6.1.6 Decision making | p. 124 |
6.2 Testing for a Population Mean | p. 124 |
6.2.1 Large sample with known [sigma] | p. 124 |
6.2.2 What is the p-value and how is it interpreted? | p. 126 |
6.2.3 Small samples with unknown [sigma] | p. 128 |
6.3 Hypothesis Testing about Proportions | p. 130 |
6.4 Hypothesis Testing about the Variance | p. 131 |
6.5 Statistical Inference about Two Populations | p. 132 |
6.5.1 Inference about the difference between two means | p. 133 |
6.5.2 Small independent samples with equal variances | p. 134 |
6.5.3 Testing the hypothesis about two variances | p. 140 |
6.6 Testing for Normality of Data | p. 142 |
Chapter 7 Statistical Process Control | p. 145 |
7.1 How to Build a Control Chart | p. 147 |
7.2 The Western Electric (WECO) Rules | p. 150 |
7.3 Types of Control Charts | p. 151 |
7.3.1 Attribute control charts | p. 151 |
7.3.2 Variable control charts | p. 159 |
Chapter 8 Process Capability Analysis | p. 171 |
8.1 Process Capability with Normal Data | p. 174 |
8.1.1 Potential capabilities vs. actual capabilities | p. 176 |
8.1.2 Actual process capability indices | p. 178 |
8.2 Taguchi's Capability Indices C[subscript PM] and P[subscript PM] | p. 183 |
8.3 Process Capability and PPM | p. 185 |
8.4 Capability Sixpack for Normally Distributed Data | p. 193 |
8.5 Process Capability Analysis with Non-Normal Data | p. 194 |
8.5.1 Normality assumption and Box-Cox transformation | p. 195 |
8.5.2 Process capability using Box-Cox transformation | p. 196 |
8.5.3 Process capability using a non-normal distribution | p. 200 |
Chapter 9 Analysis of Variance | p. 203 |
9.1 ANOVA and Hypothesis Testing | p. 203 |
9.2 Completely Randomized Experimental Design (One-Way ANOVA) | p. 204 |
9.2.1 Degrees of freedom | p. 206 |
9.2.2 Multiple comparison tests | p. 218 |
9.3 Randomized Block Design | p. 222 |
9.4 Analysis of Means (ANOM) | p. 226 |
Chapter 10 Regression Analysis | p. 231 |
10.1 Building a Model with Only Two Variables: Simple Linear Regression | p. 232 |
10.1.1 Plotting the combination of x and y to visualize the relationship: scatter plot | p. 233 |
10.1.2 The regression equation | p. 240 |
10.1.3 Least squares method | p. 241 |
10.1.4 How far are the results of our analysis from the true values: residual analysis | p. 248 |
10.1.5 Standard error of estimate | p. 250 |
10.1.6 How strong is the relationship between x and y: correlation coefficient | p. 250 |
10.1.7 Coefficient of determination, or what proportion in the variation of y is explained by the changes in x | p. 255 |
10.1.8 Testing the validity of the regression line: hypothesis testing for the slope of the regression model | p. 255 |
10.1.9 Using the confidence interval to estimate the mean | p. 257 |
10.1.10 Fitted line plot | p. 258 |
10.2 Building a Model with More than Two Variables: Multiple Regression Analysis | p. 261 |
10.2.1 Hypothesis testing for the coefficients | p. 263 |
10.2.2 Stepwise regression | p. 266 |
Chapter 11 Design of Experiment | p. 275 |
11.1 The Factorial Design with Two Factors | p. 276 |
11.1.1 How does ANOVA determine if the null hypothesis should be rejected or not? | p. 277 |
11.1.2 A mathematical approach | p. 279 |
11.2 Factorial Design with More than Two Factors (2[superscript k]) | p. 285 |
Chapter 12 The Taguchi Method | p. 289 |
12.1 Assessing the Cost of Quality | p. 289 |
12.1.1 Cost of conformance | p. 290 |
12.1.2 Cost of nonconformance | p. 290 |
12.2 Taguchi's Loss Function | p. 293 |
12.3 Variability Reduction | p. 295 |
12.3.1 Concept design | p. 297 |
12.3.2 Parameter design | p. 298 |
12.3.3 Tolerance design | p. 300 |
Chapter 13 Measurement Systems Analysis-MSA: Is Your Measurement Process Lying to You? | p. 303 |
13.1 Variation Due to Precision: Assessing the Spread of the Measurement | p. 304 |
13.1.1 Gage repeatability & reproducibility crossed | p. 305 |
13.1.2 Gage R&R nested | p. 314 |
13.2 Gage Run Chart | p. 318 |
13.3 Variations Due to Accuracy | p. 320 |
13.3.1 Gage bias | p. 320 |
13.3.2 Gage linearity | p. 322 |
Chapter 14 Nonparametric Statistics | p. 329 |
14.1 The Mann-Whitney U test | p. 330 |
14.1.1 The Mann-Whitney U test for small samples | p. 330 |
14.1.2 The Mann-Whitney U test for large samples | p. 333 |
14.2 The Chi-Square Tests | p. 336 |
14.2.1 The chi-square goodness-of-fit test | p. 336 |
14.2.2 Contingency analysis: chi-square test of independence | p. 342 |
Chapter 15 Pinpointing the Vital Few Root Causes | p. 347 |
15.1 Pareto Analysis | p. 347 |
15.2 Cause and Effect Analysis | p. 350 |
Appendix 1 Binominal Table P(x) = [subscript n]C[subscript x]p[superscript x]q[superscript n-x] | p. 354 |
Appendix 2 Poisson Table P(x) = [lambda superscript x]e[superscript -lambda]/x | p. 357 |
Appendix 3 Normal Z Table | p. 364 |
Appendix 4 Student's t Table | p. 365 |
Appendix 5 Chi-Square Table | p. 366 |
Appendix 6 F Table [alpha] = 0.05 | p. 367 |
Index | p. 369 |