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A ____ from a sample is used to estimate a population _____. The two words that best fill these blanks are:
An engineer wants to try two hardening ovens to see whether they have different hardness scores. She cuts 8 pieces of bar stock in half, putting half of each in oven A and the other half in oven B. The following data are collected:

Do the data indicate that the ovens have different average scores? Assume differences are normally distributed.