Question: A random sample of 36 drinks from a soft-drink machine has an average content of 7.4 units with a standard deviation of 0.48 unit.
A random sample of 36 drinks from a soft-drink machine has an average content of 7.4 units with a standard deviation of 0.48 unit. Test the hypothesis that u = 7.5 units against the alternative hypothesis < 7.5 at the 0.05 level of significance.
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