1) We wish to estimate the average daily yield of a chemical manufactured in a chemical plant. The mean daily yield was recorded for 50 days, and found to be 871 tons/day. The standard deviation turned out to be 21 tons. Test the null hypothesis that the average daily yield of the chemical is 880 tons at .
2) Given the following sample data, what is the best estimate of , and what is the best estimate of . 865, 870, 872, 875, 877, 880.
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