The EPA Has Stipulated That the Pollution Standard Index (PSI)for

question 52

Multiple Choice

The EPA has stipulated that the Pollution Standard Index (PSI) for clean air standards is to average no more than 100.A random sample of 9 days for the city of Acorn showed PSI readings of 144,85,90,120,150,105,93,130,and 115.The EPA wants to test to determine if Acorn's air is dirtier than the stipulated clean air standards.Assume the population of PSI readings is highly nonnormal and state the null hypothesis.

• A)H₀: M_d ≥ 100
• B)H₀: M_d ≤ 100
• C)H₀: M_d ≠ 100
• D)H₀: M_d > 100

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Recasting

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The process by which humans learn to comprehend and communicate language, typically during childhood.