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50 years ago, the mean body weight of a population of penguins was 23 kg. Researchers are concerned that the mean body weight is decreasing,
50 years ago, the mean body weight of a population of penguins was 23 kg. Researchers are concerned that the mean body weight is decreasing, so they took a random sample of 45 penguins and found the mean to be 22.3 kg. The sample standard deviation was 2.3 kg. Is this evidence, at the 5% level of significance, that the mean population weight has decreased? Complete hypothesis test.
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