4. All freshmen in a certain school were found to have variability in grades expressed as a standard deviation of 3. Two samples among these freshmen made up of 20 and 50 students were found to have means of 88 and 85 respectively. Based on their grades, is the first group really brighter than the second group at 1% level of significance? А. Но: На: B. What is the level of significance? C. Type of Test

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