The percentage of an additive in gasoline was measured six times with the following results: 0.13, 0.12,

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The percentage of an additive in gasoline was measured six times with the following results: 0.13, 0.12, 0.16, 0.17, 0.20, 0.11%. Find the 90% and 99% confidence intervals for the percentage of the additive.
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