Microsoft Office Tutorials and References
In Depth Information
Chapter 6
Inferential Statistical Analysis of Data
Contents
6.1 Introduction ................................. 178
6.2 Let the Statistical Technique Fit the Data .................... 179
6.3
2 —Chi-Square Test of Independence for Categorical Data ........... 179
6.3.1 Tests of Hypothesis—Null and Alternative ................ 180
6.4 z-Test and t-Test of Categorical and Interval Data ................ 184
6.5 An Example ................................. 184
6.5.1 z-Test: 2 Sample Means ........................ 187
6.5.2 Is There a Difference in Scores for SC Non-Prisoners and EB
Trained SC Prisoners? ......................... 188
6.5.3 t-Test: Two Samples Unequal Variances ................. 191
6.5.4 Do Texas Prisoners Score Higher Than Texas Non-Prisoners? ....... 191
6.5.5 Do Prisoners Score Higher Than Non-Prisoners Regardless of the State? .. 192
6.5.6 How do Scores Differ Among Prisoners of SC and Texas Before
Special Training? ........................... 193
6.5.7 Does the EB Training Program Improve Prisoner Scores? ......... 195
6.5.8 What If the Observations Means Are Different, But We Do Not
See Consistent Movement of Scores? .................. 197
6.6 ANOVA .................................. 198
6.6.1 ANOVA: Single Factor Example .................... 199
6.6.2 Do the Mean Monthly Losses of Reefers Suggest That the Means
are Different for the Three Ports? .................... 201
6.7 Experimental Design ............................. 202
6.7.1 Randomized Complete Block Design Example .............. 205
6.7.2 Factorial Experimental Design Example ................. 209
6.8 Summary .................................. 211
Key Terms .................................... 211
Problems and Exercises .............................. 213
χ
H. Guerrero, Excel Data Analysis , DOI 10.1007/978-3-642-10835-8_6,
C
177
Springer-Verlag Berlin Heidelberg 2010
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