The average lactation (nursing) period of all earless seals is 23 days. Grey seals are one of
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In Exercise 9.84, you were asked to use these data to decide whether the mean lactation period of grey seals differs from 23 days. There, you were to assume that the population standard deviation of lactation periods for grey seals is 3.0 days. At the 10% significance level, do the data provide evidence against that assumption?
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