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The results of a statistical analysis comparing birthweights among different smoking groups using the tukey-kramer and bonferroni methods. The analysis includes pairwise comparisons, individual confidence intervals, and significance tests. The document concludes that only the means of the nonsmoker and heavy smoker groups are significantly different.
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Analysis of Variance for Birthwei Source DF SS MS F P Smoking 3 11.673 3.891 4.41 0. Error 23 20.304 0. Total 26 31. Individual 95% CIs For Mean Based on Pooled StDev Level N Mean StDev -------+---------+---------+--------- 1 7 7.5857 0.9616 (------------) 2 5 7.2400 0.9127 (---------------) 3 7 6.3286 1.1398 (-------------) 4 8 6.0125 0.7200 (------------) -------+---------+---------+--------- Pooled StDev = 0.9396 6.0 7.0 8.
1) Tukey-Kramer method
Tukey 95% Simultaneous Confidence Intervals All Pairwise Comparisons among Levels of Smoking
Individual confidence level = 98.90%
Smoking = 1 subtracted from:
Smoking Lower Center Upper ---------+---------+---------+---------+ 2 -1.8668 -0.3457 1.1753 (------------------) 3 -2.6457 -1.2571 0.1314 (-----------------) 4 -2.9176 -1.5732 -0.2288 (--------*-------) ---------+---------+---------+---------+ -1.5 0.0 1.5 3.
Smoking = 2 subtracted from:
Smoking Lower Center Upper ---------+---------+---------+---------+ 3 -2.4325 -0.9114 0.6096 (------------------) 4 -2.7084 -1.2275 0.2534 (------------------) ---------+---------+---------+---------+ -1.5 0.0 1.5 3.
Smoking = 3 subtracted from:
Smoking Lower Center Upper ---------+---------+---------+---------+ 4 -1.6605 -0.3161 1.0284 (--------*--------) ---------+---------+---------+---------+ -1.5 0.0 1.5 3.
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2) Bonferroni method
Fisher 99.17% Individual Confidence Intervals All Pairwise Comparisons among Levels of Smoking
Simultaneous confidence level = 96.14%
Smoking = 1 subtracted from:
Smoking Lower Center Upper +---------+---------+---------+--------- 2 -1.9345 -0.3457 1.2431 (-------------------) 3 -2.7075 -1.2571 0.1932 (-----------------) 4 -2.9775 -1.5732 -0.1689 (---------*--------) +---------+---------+---------+--------- -3.0 -1.5 0.0 1.
Smoking = 2 subtracted from:
Smoking Lower Center Upper +---------+---------+---------+--------- 3 -2.5003 -0.9114 0.6774 (--------------------) 4 -2.7744 -1.2275 0.3194 (------------------) +---------+---------+---------+--------- -3.0 -1.5 0.0 1.
Smoking = 3 subtracted from:
Smoking Lower Center Upper +---------+---------+---------+--------- 4 -1.7204 -0.3161 1.0883 (--------*--------) +---------+---------+---------+--------- -3.0 -1.5 0.0 1.