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    standard: mean = 3.881; 90% confidence interval: 3.809-3.952
 autobox: mean = 4.915; 90% confidence interval: 4.365-5.465
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    standard: mean = 4.100; 95% confidence interval: 3.866-4.335
 autobox: mean = 4.695; 95% confidence interval: 4.402-4.989