Mathematics, 07.11.2019 21:31 jbot9050
The ph measurements of water specimens from various locations along a given river basin are normally distributed with standard deviation 0.3. the average ph of water specimens from 4 randomly selected locations on this river basin is 7.8
a) based on these data, a 95% confidence interval for mean has a margin of error of?
b) if instead of 4 water specimens we had measured the ph of 16 water specimen, the a margin error of a 95% confidence interval for mean would be?
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