Page 3 The Environmental Protection Agency regulates the amount of lead in tap water. According to EPA regulations, if lead concentrations exceed 15 ppb in more than 8% of customer faucets sampled then the local Water Department must take "additional steps" such as replacing service lines and informing the public. Note: ppb means “parts per billion". Suppose that in a particular city a large number of faucets were tested and lead levels recorded and the 80th percentile was determined to be 16 ppb. Assume that the sample is large enough for the EPA to obtain meaningful results. Must the water department in this city take "additional steps"? Choose the single answer that best describes your conclusion and reasoning. a. Yes; additional steps are required because 80% of the faucets tested have a lead level equal to 16 ppb. b. Yes; additional steps are required because at least 20% of the faucets tested have lead levels higher than 15 ppb. c. Yes; additional steps are required because at least 80% of the faucets tested have lead levels higher than 15 ppb. d. Not enough information is provided to answer this question.

Page 3 The Environmental Protection Agency regulates the amount of lead in tap water. According to EPA regulations, if lead concentrations exceed 15 ppb in more than 8% of customer faucets sampled then the local Water Department must take "additional steps" such as replacing service lines and informing the public. Note: ppb means “parts per billion". Suppose that in a particular city a large number of faucets were tested and lead levels recorded and the 80th percentile was determined to be 16 ppb. Assume that the sample is large enough for the EPA to obtain meaningful results. Must the water department in this city take "additional steps"? Choose the single answer that best describes your conclusion and reasoning. a. Yes; additional steps are required because 80% of the faucets tested have a lead level equal to 16 ppb. b. Yes; additional steps are required because at least 20% of the faucets tested have lead levels higher than 15 ppb. c. Yes; additional steps are required because at least 80% of the faucets tested have lead levels higher than 15 ppb. d. Not enough information is provided to answer this question.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.6: Summarizing Categorical Data

Problem 26PPS

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