Question

A certain chemical pollutant in the Arkansas River has been constant for several years with mean μ = 34 ppm (parts per million). A group of factory representatives whose companies discharge liquids into the river is now claiming they have lowered the average with improved filtration devices. A group of environmentalists will test to see if this is true. Find the rejection region appropriate for this test if we are using a significance level of 0.05 and have a sample size of 25.

Group of answer choices

Reject H₀ if t < -1.960

Reject H₀ if t < -1.708

Reject H₀ if t < -1.711

Reject H₀ if t < -2.064 or t > 2.064

Reject H₀ if t < -2.064

Answer 1