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Dr. D is at it again. This time he is curious about the impact of church attendance on obesity. He forms two groups the Church Attenders and the Non-Church Attenders. Dr. D’s null hypothesis is that obesity rates are not different for both groups. After weighing hundreds of people Dr. D is ready to crunch the numbers. His results indicate that there is no significant difference between the two groups. Dr. D proclaims that church does not in fact cause obesity. However, due to accidentally sampling the “cross fit” group at a local church, his church obesity data was not an accurate representation of average church attenders. In fact, there was a difference in obesity rates between Church Attenders and the Non-Church Attenders.