Researchers interested in lead exposure due to car exhaust

Researchers interested in lead exposure due to car exhaust sampled the blood of 52 police officers subjected to constant inhalation of automobile exhaust fumes while working traffic enforcement in a primarily urban environment. The blood samples of these officers had an average lead concentration of 124.32 μg/l and an SD of 37.74 μg/l; a previous study of individuals from a nearby suburb, with no history of exposure, found an average blood level concentration of 35 μg/l.Write down the hypotheses that would be appropriate for testing if the police officers appear to have been exposed to a different concentration of lead. Assume all necessary conditions are satisfied for inference on these data. Test the hypothesis that the downtown police officers have a higher lead exposure than the group in the previous study. State the conclusion. (Since it’s a hypothesis test for a mean and the population standard deviation is unknown, you should conduct a t-test.)

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