Lithium carbonate is a drug used to treat bipolar mental disorders. The average dose in well-maintained patients is 1.3 mEq/L with standard deviation 0.3 mEq/L. A random sample of 25 patients on lithium demonstrates a mean level (x¯x¯) of 1.4 mEq/L. Test to see whether this mean is significantly higher than that of a well-maintained patient population. Use a two-sided alternative hypothesis for your test. a) What is a z statistic?

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Lithium carbonate is a drug used to treat bipolar mental disorders. The average dose in well-maintained patients is 1.3 mEq/L with standard deviation 0.3 mEq/L. A random sample of 25 patients on lithium demonstrates a mean level (x¯x¯) of 1.4 mEq/L. Test to see whether this mean is significantly higher than that of a well-maintained patient population. Use a two-sided alternative hypothesis for your test.

a) What is a z statistic?

 

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