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

Multiple Choice

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. 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 non-normal and state the null hypothesis.

A) H₀: M_d $\ge$ 100
B) H₀: M_d $\le$ 100
C) H₀: M_d $\neq$ 100
D) H₀: M_d > 100