A researcher suspects the mean trough (the lowest dosage of medication required to see clinical improvement of symptoms) level for a medication used to treat arthritis is higher than was previously reported in other studies. If previous studies found the mean trough level of the population to be 3.7 micrograms/mL, and the researcher conducts a study among 93 newly diagnosed arthritis patients and finds the mean trough to be 6.1 micrograms/mL with a standard deviation of 2.4 micrograms/mL, for a level of significance of 1%, what should the researcher’s decision rule look like?
Reject H0ifzis less than or equal to –2.326.
Reject H0ifzis greater than or equal to 2.326.
Reject H0ifzis less than or equal to –2.576.
Reject H0ifzis greater than or equal to 2.5760
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