Nine determinations of the specific heat of iron had a standard deviation of 0.0086. Assuming that these

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Nine determinations of the specific heat of iron had a standard deviation of 0.0086. Assuming that these determinations constitute a random sample from a normal population, test the null hypothesis σ = 0.0100 against the alternative hypothesis σ < 0.0100 at the 0.05 level of significance.
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