basics of minitab 15 (english) v1
TRANSCRIPT
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Minitab 15 (English)
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Minitab 15 : Introduction
Minitab
Is an Application Software for Studying Statistical Tools and applying them for Business needs. It complements Six Sigma for its features and ease of implementation. Different customized tools and techniques used in Six Sigma are available in Minitab. Minitab can also be used to plot different Graphs & Charts which are widely used during Six Sigma Project execution and different Business Processes.
Trial version of Minitab 15
Free 30 Days Trial version of Minitab 15 can be downloaded from http://minitab.com/products/minitab/demo/
Limited customer support can also be availed during the trial period.
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Minitab 15 : Introduction
Opening and Saving Minitab File• In Minitab, there are projects (Minitab Project, *.mpj) in which • Data is stored in Minitab Worksheet, *.mtw• Graphs are stored in Minitab Graphs, *.mgf• Results in Minitab Session, *.txt
Menu Bar
Tool Bar
Minitab Project
Session Window
Tables and Statistical outputs are displayed in Session window
Minitab Worksheet
Worksheet is used for Data Input. This is similar to MS excel sheet. Use ‘Enter’ and ‘Tab’ key to navigate.
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Minitab 15 : Introduction
Basic Tips
Minitab uses different customized pre-defined functions to perform statistical tests for analysis, hence very sensitive to input data.
Before applying any tool / performing any test different pre-requisites need to be verified to get reliable output.
Minitab can recognize 3 Data types : Numeric, Text and Date. Data types are displayed at column indicators as C1 (Numeric), C1-T (Text), C1-D (Date). While entering data consider the display of data type in column indicator to ensure there is no mismatch.
Minitab worksheet is used for data input. Output is displayed in Session Window (Table and Text) and through Graphs.
Minitab uses default values (e.g. Alpha=0.05 for Hypothesis Testing) for different tools and techniques. This parameters can be set at different levels as per the need and interpretation / inference should be made accordingly.
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Minitab 15 : Basic
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Topics
• Graphical Summary
• Normality Test
• Histogram
• Box Plot
• Dot Plot
• Pareto Chart
• Cause & Effect Diagram
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Graphical Summary
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Graphical Summary
6560555045
Median
Mean
56.556.055.555.054.554.053.5
1st Quartile 52.364Median 55.3873rd Quartile 57.965Maximum 64.605
53.985 56.609
53.474 56.389
3.856 5.753
A-Squared 0.29P-Value 0.594
Mean 55.297StDev 4.617Variance 21.314Skewness 0.145280Kurtosis -0.365280N 50
Minimum 44.910
Anderson-Darling Normality Test
95% Confidence I nterval for Mean
95% Confidence I nterval for Median
95% Confidence I nterval for StDev95% Confidence I ntervals
Summary for Ticket Resolution Time (Mins)
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Normality Test
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Histogram
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Normality Test - Histogram
6560555045
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605040
30
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1
Ticket Resolution Time (Mins)
Perc
ent
Mean 55.30StDev 4.617N 50AD 0.292P-Value 0.594
Probability Plot of Ticket Resolution Time (Mins)Normal
6560555045
12
10
8
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Ticket Resolution Time (Mins)
Frequency
Mean 55.30StDev 4.617N 50
Histogram of Ticket Resolution Time (Mins)Normal
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Box Plot
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Dot Plot
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Box Plot - Dot Plot
65
60
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Tick
et
Reso
lution T
ime (
Min
s)
Boxplot of Ticket Resolution Time (Mins)
63605754514845Ticket Resolution Time (Mins)
Dotplot of Ticket Resolution Time (Mins)
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Pareto Chart
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Pareto Chart
Defect Count 56 35 28 18 12 7 5 8Percent 33.1 20.7 16.6 10.7 7.1 4.1 3.0 4.7Cum % 33.1 53.8 70.4 81.1 88.2 92.3 95.3 100.0
Defect Types
Other
Impr
oper
Strin
g
Func
tiona
lity
Memory L
eak
Run T
ime
Error
Logic
al
Stan
dard Violat
ion
Syntax
180
160
140
120
100
80
60
40
20
0
100
80
60
40
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Defe
ct C
ount
Perc
ent
Pareto Chart of Defect Types
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Cause & Effect Diagram
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Cause & Effect Diagram
Incidents
Application
Back Up
Hardware
Operating System
Job failures
FI le permission
Printing Issues
Services not running
System Panic
Swap Utilization
Memory Utilization
CPU Utilization
File System Capacity
Power Supply failures
Drive Broken
Network Errors
Printer Problem
Memory Problem
LAN Card Problem
CPU Problem
Disk Problem
Tapes write protected
Scheduler Problem
Backup overrun
Drive Problem
Faulty Media
Tape not loaded
EDG Application alerts
FTP job failure
Delayed process
Application interface failure
Application service stopped
Application schedule
Oracle processes not running
Listner unavailable
Oracle GOH Alerts
Cause-and-Effect Diagram
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Minitab 15 : Intermediate & Advanced Tools
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Minitab 15 : ANOVA
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Topics
• One-Way ANOVA
• Two-Way ANOVA
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One-way ANOVA
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One-way ANOVAOne-way ANOVA: Defect Count versus Experience Level
Source DF SS MS F PExperience Level 2 52303.6 26151.8 363.72 0.000Error 12 862.8 71.9Total 14 53166.4
S = 8.479 R-Sq = 98.38% R-Sq(adj) = 98.11%
Individual 95% CIs For Mean Based on Pooled StDevLevel N Mean StDev --------+---------+---------+---------+-<1 Year 5 210.60 11.84 (-*-)>4 Years 5 66.80 7.98 (*-)1~4 Years 5 125.20 3.42 (-*-) --------+---------+---------+---------+- 100 150 200 250Pooled StDev = 8.48
1~4 Years>4 Years<1 Year
225
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Experience Level
Defe
ct C
ount
Boxplot of Defect Count
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Two-way ANOVA
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Two-way ANOVATwo-way ANOVA: Price versus City, Stars
Source DF SS MS F PCity 3 21145.4 7048.5 4.12 0.017Stars 1 10224.5 10224.5 5.97 0.022Interaction 3 3411.0 1137.0 0.66 0.582Error 24 41079.0 1711.6Total 31 75859.9
S = 41.37 R-Sq = 45.85% R-Sq(adj) = 30.05%
Individual 95% CIs For Mean Based on Pooled StDevCity Mean +---------+---------+---------+---------DC 135.375 (--------*-------)La 135.375 (--------*-------)NY 198.125 (--------*-------)SF 151.375 (-------*--------) +---------+---------+---------+--------- 105 140 175 210
Individual 95% CIs For Mean Based on Pooled StDevStars Mean --+---------+---------+---------+-------2 137.188 (----------*---------)3 172.938 (---------*----------) --+---------+---------+---------+------- 120 140 160 180
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Minitab 15 : Control Charts
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Topics
• I-MR
• X-Bar/R
• P-Chart
• NP-Chart
• U-Chart
• C-Chart
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I-MR Chart
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I-MR Chart
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X-Bar/R Chart
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X-Bar/R Chart
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NP-Chart
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NP-Chart
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P-Chart
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P-Chart
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U-Chart
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U-Chart
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C-Chart
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C-Chart
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Minitab 15 : Capability Analysis
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Capability Analysis : Normal
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Capability Analysis : Normal
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Capability Analysis : Binomial
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Capability Analysis : Binomial
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Capability Analysis : Poisson
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Capability Analysis : Poisson
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Minitab 15 : Correlation-Regression
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Topics
• Scatter Plot
• Correlation
• Regression
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Scatter Plot
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Scatter Plot
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Correlation
Correlations: Productivity, Experience
Pearson correlation of Productivity and Experience = 0.871P-Value = 0.000
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Regression Analysis
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Regression AnalysisRegression Analysis: Productivity versus Experience
The regression equation isProductivity = - * + 11.5 Experience
Predictor Coef SE Coef T PConstant -9.7 136.1 -0.07 0.945Experience 11.520 2.057 5.60 0.000
S = 87.7955 R-Sq = 75.8% R-Sq(adj) = 73.4%
Analysis of Variance
Source DF SS MS F PRegression 1 241811 241811 31.37 0.000Residual Error 10 77080 7708Total 11 318892
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Regression Analysis
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Regression AnalysisRegression Analysis: Effort versus Code Length, Defect Count, ...
The regression equation isEffort = - 1277 + 458 Code Length + 136 Defect Count - 1.54 Resource Experience
Predictor Coef SE Coef T PConstant -1277.3 360.6 -3.54 0.003Code Length 457.70 47.64 9.61 0.000Defect Count 135.72 61.28 2.21 0.042Resource Experience -1.544 4.579 -0.34 0.740
S = 487.537 R-Sq = 86.9% R-Sq(adj) = 84.5%
Analysis of Variance
Source DF SS MS F PRegression 3 25308562 8436187 35.49 0.000Residual Error 16 3803071 237692Total 19 29111633
Source DF Seq SSCode Length 1 23966672Defect Count 1 1314871Resource Experience 1 27018
Unusual Observations
CodeObs Length Effort Fit SE Fit Residual St Resid 11 9.00 4631 3707 308 924 2.44R
R denotes an observation with a large standardized residual.
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Minitab 15 : Hypothesis Testing
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Topics
• 1-Sample-Z
• 1-Sample-T
• 2-Sample-T
• Paired T
• F-Test
• Chi-square
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1 Sample Z
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1 Sample ZOne-Sample Z: Daily Call volume past month
Test of mu = 310 vs not = 310The assumed standard deviation = 10
Variable N Mean StDev SE Mean 95% CI ZDaily Call volume past m 22 329.05 22.91 2.13 (324.87, 333.22) 8.93
Variable PDaily Call volume past m 0.000
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1 Sample T
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1 Sample TOne-Sample T: Daily Call volume past month
Test of mu = 325 vs not = 325
Variable N Mean StDev SE Mean 95% CI TDaily Call volume past m 22 329.05 22.91 4.88 (318.89, 339.20) 0.83
Variable PDaily Call volume past m 0.417
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2 Sample T
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2 Sample TTwo-Sample T-Test and CI: Defects/10,000 Old Method, Defects/10,000 New Method
Two-sample T for Defects/10,000 Old Method vs Defects/10,000 New Method
N Mean StDev SE MeanDefects/10,000 Old Metho 35 252.9 18.7 3.2Defects/10,000 New Metho 20 225.5 14.8 3.3
Difference = mu (Defects/10,000 Old Method) - mu (Defects/10,000 New Method)Estimate for difference: 27.4495% CI for difference: (17.66, 37.22)T-Test of difference = 0 (vs not =): T-Value = 5.63 P-Value = 0.000 DF = 53Both use Pooled StDev = 17.3927
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Paired T
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Paired TPaired T-Test and CI: Weight - Before, Weight - After
Paired T for Weight - Before - Weight - After
N Mean StDev SE MeanWeight - Before 11 85.14 3.32 1.00Weight - After 11 75.13 4.01 1.21Difference 11 10.008 3.037 0.916
95% CI for mean difference: (7.968, 12.048)T-Test of mean difference = 0 (vs not = 0): T-Value = 10.93 P-Value = 0.000
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F Test
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F Test
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Chi-square
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Chi-square
Chi-Square Test: England, Australia, Pakistan, Srilanka
Expected counts are printed below observed countsChi-Square contributions are printed below expected counts
England Australia Pakistan Srilanka Total 1 72 82 130 95 379 85.92 96.82 135.20 61.06 2.255 2.269 0.200 18.867
2 125 140 180 45 490 111.08 125.18 174.80 78.94 1.744 1.755 0.155 14.593
Total 197 222 310 140 869
Chi-Sq = 41.838, DF = 3, P-Value = 0.000
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Thank You