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Suppose you do a study of acupuncture to determine how effective it is in relieving pain. You measure sensory rates for 15 subjects with the results given below. Use the sample data to construct a 95% confidence interval for the mean sensory rate for the population (assumed normal) from which you took the data. Person 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Sensory 8.6 9.4 7.9 6.8 8.3 7.3 9.2 9.6 8.7 11.4 10.3