Q4. A company claims that the average weight of a certain type of battery it produces is
50 grams. A quality control inspector selects a random sample of 30 batteries from the
latest production batch and finds an average weight of 49 grams with a standard
deviation of 2 grams. Test at a 0.05 significance level to determine if there is enough
evidence to suggest that the average weight of the batteries differs from 50 gram
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