5. A group of researchers wanted to know it running marathons is associated with developing arthritis. They surveyed a random sample of 431} American marathon runners and a random sample of 9526 Americans who do not run marathons and asked them if they had been diagnosed with arthritis. They calculated the 95% confidence interval for the difference in the proportion of marathon runners with arthritis from the proportion of non-marathon runners with arthritis to he lemming\" pm, mama\" = (D. 12, (I. BE]. a. Write a concluding statement for this confidence interval. [il] b. The researchers claim this study provides strong evidence that marathon running is associated with lower rates of arthritis. Do you agree? Why or why not? [I2]