查看完整版本 : confidence interval

k1994 2016-11-10 06:17 PM

confidence interval

Students took 12 samples of water from a nearby river and measured the amount of sodium.Let X denote the amount of sodium (in ppm). Assume that the distribution of X is N(µ, σ).

The following data give 12 observations on X.

26.0, 21.6, 25.9, 20.6, 26.5, 28.4, 29.1, 22.9, 23.2, 25.0, 22.5, 24.2

Find a 90% confidence interval for the mean of the amount of sodium.
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查看完整版本: confidence interval