For over 25 years, Fishy company has been selling canned sardines, mainly with a net (mean) weight

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For over 25 years, Fishy company has been selling canned sardines, mainly with a net (mean) weight of 425 g. To your surprise, management has not tested the actual mean weight of cans in the last three years, and you wonder if the net mean weight of 425 g is still appropriate. What would be the null and alternative hypothesis to test this?

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