what type of statistical test is required for cognitive testing? what type of test is needed to study creatine which statistical test is used to measure sleep deprived subjects what statistical test is needed here what type of test is needed for a sleep deprived person to take placebo what type of test is used to measure cognitive function what type of test is needed for cognitive testing in sleep deprived and awake subjects what stats are needed for the nasa trial what statistical test is needed by sleep deprived people? what type of test for sleep deprived people which statistical tests are necessary for sleep deprived subjects what type of test is needed for a brain study what type of statistical test is needed for a study into the effects of acute creatine supplement on cognitive function which statistical test is needed to evaluate an effects creatine supplement on sleep deprived patients? what statistical test is needed for sleep deprived individuals? which statistical test is needed for sleep deprived patients? what type of test for placebo and creatine effects of creatine supplements which statistical test should be used to test for placebo what statistical tests are used to study sleep deprived subjects?