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data: Welch Two Sample t-test Names_w$call back and Names_b$call_back t = 4.1147, df = 4711.6, p-value = 3.943e-05 alternative hypothesis: true difference in means

data: Welch Two Sample t-test Names_w$call back and Names_b$call_back t = 4.1147, df = 4711.6, p-value = 3.943e-05 alternative hypothesis: true difference in means is not equal to 0 95 percent confidence interval: 0.01677067 0.04729503 sample estimates: mean of x mean of y 0.09650924 0.06447639

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