1.

Archaeologists recently analyzed the skeletal remains of 8 males from each of three different time periods (Prehistoric Era, Middle Ages, and the Modern Era) to determine there was a significant difference in their average height. Assume that the heights in all three populations are normally distributed. What are the null and alternative hypotheses for testing if the average height of humans in the three different eras are significantly different ? O HO: HP -HA HE HA: All mean heights are not equal HO : HP HA - HE HA: At least two mean heights are not equal (or at least one pair of mean heights is not equal) Ho: Op -OA OF HA: At least two standard deviation heights are not equal (or at least one pair is not equal)