Lead Levels in Blood A study reported inthe American

Chapter 15, Problem 19

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Lead Levels in Blood A study reported inthe American Journal of Public Health (ScienceNews)the first to follow blood lead levels in lawabidinghandgun hobbyists using indoor firingrangesdocuments a significant risk of lead poisoning.4Lead exposure measurements were made on17 members of a law enforcement trainee class before,during, and after a 3-month period of firearm instructionat a state-owned indoor firing range. No traineehad elevated blood lead levels before the training, but15 of the 17 ended their training with blood lead levelsdeemed elevated by the Occupational Safety andHealth Administration (OSHA). If the use of an indoor firing range causes no increase in blood lead levels,then p, the probability that a persons blood lead levelincreases, is less than or equal to .5. If, however, useof the indoor firing range causes an increase in a personsblood lead levels, then p .5. Use the sign testto determine whether using an indoor firing range hasthe effect of increasing a persons blood lead levelwith a .05. (HINT: The normal approximation tobinomial probabilities is fairly accurate for n 17.)