The EPA has stipulated that the PSI,"Pollution Standard Index" for clean air standards is to be no more than 100 on the average.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. Assume the population of PSI readings is highly non-normal.Is there significant evidence to conclude that Acorn's air is dirtier than the stipulated clean air standards? Test at $\alpha$ = .05.
A)Reject the null hypothesis
B)Fail to reject the null hypothesis

Question

Quizplus · Accepted Answer

Failed to reject H₀.No,Acorn's air is not dirtier than the stipulated clean air standards.H₀: M_d $\le$ 100 or H₀: M_d = 100,H_A: M_d > 100Reject H₀ if p-value is < $\alpha$ p-value = P(X $\ge$ 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.

The EPA Has Stipulated That the PSI,"Pollution Standard Index" for Clean