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Some archaeologists theorize that ancient Egyptians interbred With several different immigrant populations over thousands of years. To see if there is any indication of changes in body structure that might have resulted, they measured 15 skulls of male Egyptians dated from 4000 BCE and 15 others dated from 200 BCE. a. create a 95% condence interval for the difference in mean skull breadth between these two eras? b. State all the necessary assumptions needed to answer part (a). if the data from 4000 BCE are coming from a normal distribution. Why