Multiple Choice 3. 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? [1] Reject Ho if z is less than or equal to -2.326. [2] Reject Ho if z is greater than or equal to 2.326. [3] Reject Ho if z is less than or equal to -2.576. [4] Reject Ho if z is greater than or equal to 2.5760