The percentage of additive in gasoline was measured six times with the following

Question

The percentage of additive in gasoline was measured six times with the following results: 0.13, 0.10, 0.16, 0.16, 0.20, 0.18%. Find the 90% and 99% confidence intervals for the percentage of the additive. (Use Table 4-2 to find t values for the calculations.)

The percentage of additive in gasoline was measured six times with the following results: 0.13, 0.10, 0.16, 0.16, 0.20, 0.18%. Find the 90% and 99% confidence intervals for the percentage of the additive. (Use Table 4-2 to find t values for the calculations.) 90% confidence interval 99% confidence interval

Explanation / Answer

Xmean = (1/6)*(.13+.11+.16+.18+.20+.19) = 0.1616666667
S^2(X) = (.13^2+.11^2+.16^2+.18^2+.20^2+.19^2-6*.

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