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 Acme showed PSI readings of 144, 85, 90, 120, 150, 105, 93, 130, and 115. Assume the population of PSI readings is highly nonnormal. Is there significant evidence to conclude that Acme air is dirtier than the stipulated clean air standards? Test at α = .05.
A) Reject the null hypothesis.
B) Do not reject the null hypothesis.

Question

Quizplus · Accepted Answer

H₀: M_d≤ 100 or H₀: M_d = 100, H_A: M_d> 100 Reject H₀if p value is < α p value = P(X ≥ 6) = P(X = 6) + P(X = 7) + P(X = 8) + P(X = 9) p value = .1641 + .0703 + . 0176 + .002 = .254 .254 > .05, failed to reject H₀. Test failed to reject H₀. No, Acme's air is not dirtier than the stipulated clean air standards.

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