the additive in gasoline was measured six times with following results: 0.13, 0.12, 0.16, 0.17, 0.20, and 0.11 ppm the confidence interval at 95% confidence level would be at (t = 2.57)
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gasoline, =0.13, 0.12+2.86so the answer become s=2.57 not t=2.57
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