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e. Obtain and paste the side-by-side boxplots of percentage change in traffic fatalities for the two groups into your report. Compare the centers and spreads
e. Obtain and paste the side-by-side boxplots of percentage change in traffic fatalities for the two groups into your report. Compare the centers and spreads of the two distributions. Compare your results to those in part (a). Comment about the shape (symmetric, skewed, or neither) of each distribution. Are there any outliers? Comment on the assumption of equal variability for the two independent sample t-tools. Is there any evidence that this assumption may be seriously violated? Boxplots of percentage change in traffic fatalities 75.00 50.00 25.00 percentchg .00 25.00 50.00 .00 1.00 increaseDescriptives increase Statistic Std. Error percentchg .00 Mean -7.4688 6.69738 95% Confidence Interval Lower Bound -21.5395 for Mean Upper Bound 6.6018 5% Trimmed Mean -7.4136 Median -9.6774 Variance 852.243 Std. Deviation 29.19320 Minimum -60.00 Maximum 44.07 Range 104.07 Interquartile Range 41.22 Skewness .170 524 Kurtosis -.440 1.014 1.00 Mean 13.8503 3.67741 95% Confidence Interval Lower Bound 6.3502 for Mean Upper Bound 21.3505 5% Trimmed Mean 13.3323 Median 12.1173 Variance 432.747 Std. Deviation 20.80256 Minimum -22.22 Maximum 62.50 Range 84.72 Interquartile Range 30.12 Skewness .254 414 Kurtosis -.296 .809
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