1) A metallurgist wants to determine the degree of homogeneity in a sample of a metal alloy. The concentration of manganese, a trace component of the alloy, is measured as sevrnl loations in the sample. The results are given below, in units of ppm by mass (parts per million by mas). 245. ppm 223. ppm 266. ppm 253. ppm 255. ppm 241. ppm 270. ppm 236. ppm 259. ppm Find the average concentration of manganese in the alloy (in ppm), and the 95% confidence limits for the average value.

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1) A metallurgist wants to determine the degree of homogeneity in a sample of a metal alloy. The concentration of
manganese, a trace component of the alloy, is measured a several locations in the sample. The results are given
below, in units of ppm by mass (parts per million by mass).
245. ppm
223. ppm
266. ppm
253. ppm
255. ppm
241. ppm
270. ppm
236. ppm
259. ppm
Find the average concentration of manganese in the alloy (in ppm), and the 95% confidence limits for the average
value.
Transcribed Image Text:1) A metallurgist wants to determine the degree of homogeneity in a sample of a metal alloy. The concentration of manganese, a trace component of the alloy, is measured a several locations in the sample. The results are given below, in units of ppm by mass (parts per million by mass). 245. ppm 223. ppm 266. ppm 253. ppm 255. ppm 241. ppm 270. ppm 236. ppm 259. ppm Find the average concentration of manganese in the alloy (in ppm), and the 95% confidence limits for the average value.
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