Mathematics: A long series of measurements on a check weight averages out to 253 micrograms above 10 grams, and the SD is 7 micrograms. The Gauss model is believed to apply, with negligible bias. At this point, the balance has to be rebuilt, which may introduce bias as well as changing the SD of the error box. Ten measurements on the checkweight, using the rebuilt scale, show an average of 245 micrograms above ten grams, and the SD is 9 micrograms. Has bias been introduced? Or is this chance variation?

j = 9.65Step-by-step explanation: = jj = 9.649743588... (round as needed)...

A long series of measurements on a check weight

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06.08.2021

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